You might get that tire under there with trimming and bending, but NEVER with that backspacing on the wheel. You’ll be all in the fender with the wheel and tire sticking out that far.

Look at the ride height page, lots of good info.

Bad news...........its gonna scrub!   Sorry.
On the fronts .....the best you gonna do is 225-60-15 and even that is IF you fold the fender lip.  Been there...........switched to 215-65-15 and am mucho happier.
Won't nobody know butt you that you had to go with a tad smaller tire.
Not sure butt...........Mustang II front end (lose the shock towers) MIGHT let you get away with wider fronts.
6sally6
PS Welcome to the forum......(Guaranteed  best bunch of "Mustang-smart" guyz on the net......period!)

Note the car on the Ride Height page with that same rim.  You need a smaller tire to make it work.  Of course, if you modify the fender, you can install a tractor tire up there.
They do make that TT-D wheel now with a more favorable deeper backspacing which will help your cause.  4.5” backspacing will work, but the tire may rub the upper control arm.  4.25” seems to work well.  If you are going to cut fenders, put your originals in the attic for future use.  Cut up some Taiwan versions.

You WILL want to swap back to a reasonable size tire once you drive the car.

I have used the 235x60/15 on 70 model without problems using a 15x7 with 4.25” backspacing.

I have 225/60-15 front and rear with Torq-Thrust "D" wheels (3/75" BS).  I had to bend the lips on the front fenders to avoid rubbing.  As others posts indicated, 215/60s may be a better choice.
When I installed the MII front suspension, with the same 225/60 tires and the same wheels, the clearance was reduced even more.  Note that the recommended BS is 4-4.5" with this suspension upgrade.  On a hard turn, the tire does slightly rub.
For the rear, I have a 9" rear from a 59 Ford, the 225s are not an issue, I believe you could go to 245s with the right BS.

Can you 'really' tell the difference between this 215-65-15 ....and 225-60-15?!  Not unless you get down and check the sidewall numbers!.....Well, there is one other way to check.......these don't have scrub marks all along the side walls!
As far as driving with fat tarz.....you MIGHT hafta 'man-up' just a dab when parallel parking butt, you know that won't be very often. Once you are moving more than 2 or 3 mph it steers like a power steering car. These things are so light...parking lot steering is NOT an issue. I did the Shelby drop and used the alignment specs Daze has on his web site.(he's a Mustang Steve member)
As far as handling....that's more a function of suspension than fat tarz. 1" sway bar....export bar...Monte Carlo bar... decent shocks....and it will handle like its on the 'proverbial rails'!
If you remember.......(how old are you Chuck, you may not remember!? ) Shelby won a bunch of stuff with 65-66 Mustang using the stuff I just listed above.......on BIAS tires back-in-the-day!!
You don't really need a lot of after market goodies to have an EXCELLENT handling car for even 'spirited street driving'! IMHO
6sally6

Last edited by 6sally6 (8/04/2020 3:06 PM)

6sally6 wrote:

 
Hey, I know where that picture was taken, right beside my fave place in Surfside, the River City Cafe.
You haven’t had a burger till you had one from there.
Thanks for posting that Mike, good memories,  don’t know if we will ever be back there with all this Wuhan virus crap going on.

6sally6 wrote:

What size tires are these front and back and are rims 7 by15 with the 3.75 backspace?