We need Al Newman, our resident Falcon expert, to chime in here.  I believe the 64 is an oddball size that doesn't match anything else.  If it is the same as 67 Mustang, then I can help, but I am not sure of the exact size.

   As for the Falcon vs. Mustang spindles
   1963-64 Falcon tie rod taper is .568/.623
   1965 Falcon tie rod taper is .450/.515
   1965-66 Mustang tie rod taper is .450/.515
   1967-69 Mustang tie rod taper is .507/.560

It looks like the 64 Falcon is same as the Granada tie rod size on the big end of the tapered hole, so the TRB-65GR adapters are your best bet.

Madscience ,
             over the years of messing around with all types of cars based on the x200 1960 falcon chassis mustang/comet/fair....etc. etc. I have come to the realization all those parts I thought were so similar that should be interchangable aren't....although Ford stuck to the same general design for 20 years they kept themselves busy constantly slightly reworking those parts some times for no rhyme or reason. However in 1965 the Falcon steering system was redesigned to minimize some of the bumpsteer issues found in the earlier systems. The 1963-4 Falcon /Comet centrelink has the inner tie rods placed further outboard than the '65 centerlink hence greater tendency to understeer and they will NOT interchange because they are different lengths. If your goal is to improve handling you could swap your entire steering system for the '65 yes the whole thing including the box because it has a larger sector shaft you cant just swap the centrelink. I would just replace the inners with original 63-4 inners the sleeves will accept late model outers use the same outers as your new spindles (granada maverick mustang etc.) the only time you need a special outer tie rod is with '65 falcon & '65-'66 mustang power steering LH outer .

Seems that the 63-64 Falcon front suspension was an adaptation of maybe the Fairlane.  Can't speak to the understeer comment;however, because of the short tie rod, both inner and outer, the cars do exhibit quite a bit of bump steer.  If you plan to keep the car, my suggestion would be to install a '65 Falcon center link, which  will allow a longer tie rod assembly and much improved handling.  The tie rods, idler arm, spindles, and pitman arm for the '65 Falcon V8 are identical to the 65-66 Mustang V8.  Spindle casting numbers for the '65 Falcon and Mustang are probably the same;  however the '66 Mustang spindles will have a different casting number even though they are dimensionally identical to the '65 Falcon/Mustang.  The '66 Falcon suspension shares the '67-68 Mustang suspension, so it can't be used.
Best,
Al

Madscience,
                     unfortunately as I stated the '65 centrelink will not bolt onto the '63-4 pitman arm it is a totally different part the 63-4 V8 steering box has a 1 1/8 sector shaft while the '65 V8 has a 1" sector however the good news for manual steering cars is that 64-5 6 cyl (not '63 it has a 1"longer steering shaft) box is 1" sector and is a dime a dozen if doing the entire swap you need: '65 only V8 or 64-5 falcon/comet 6 cyl steering box/shaft, 65 falcon/comet V8 or 64.5-66 mustang pitman & idler arms, 65 only Falcon/Comet V8 manual centerlink(no one repros the p/s centrelink), 65 falc/com or 64.5-66 mustang inner tie rods......to answer your question: the outer tie rod ends can be from maverick, mustang, granada,comet unless it is p/s then you need one Mustang Steve sleeve for the LH outer tre or a special tre that has the larger stud for $90 - cheers
*have you thought of just redoing your 64 tre's and buying the bracket that turns your V8 drum brakes into discs? I assume thats what you are trying to do you can do either a stock 65 66 mustang KH 4 piston disc conversion, 67-68 single piston or aftermarket conversion with a simple bolt on plate

Last edited by falconeh (9/25/2015 1:14 PM)

Use '65 Falcon/Comet std steer center link and V8 spindles or 65-66 Mustang spindles.  Cannot use Mustang center link as it is 1-2 inches longer.  With this setup, you can use idler arm, inner and outer tie rods, and Pittman arm from a Mustang along with a 64-65 std 6 cylinder Falcon/Comet steering gear box.  My experience with early Fairlane suspension is limited, but I don't think anything is useable for you.
Best
Al