My advice.............do the Shelby drop first, then go from there. It tends to lower the front an inch or more. (seems all cars are different)
More trouble.........removing the springs and etc. twice butt ....IF it drops too much THEN you gotta do it anyway to install thicker isolation pads!
BTW....my springs had a full coil cut off.  Rides great butt-eye had to get thicker pads to get it back up.

Why not try 6 cylinder springs?! The V-8 will put it down some and with good shocks ride won't suffer!  I bet they are REASONABLE from Rock Auto.  Jus say'in
6sal6

I have 620# springs (not modified either) and Arning drop.

Distance from bottom of fender to center of wheel is 13”.

I’m running 235/40/18 pirelli tires (these seem on narrow side compared to other brands) on 18x7.5 wheel.

Final backspacing with 1” wheel spacer is 4.75”.

4.5” backspacing would probably be better...at least for this wheel/tire combo.

At full turns noticed light rub on tire, not wheel to front frame rail.  Not an issue 99% percent of time.

I had these 620# springs WITHOUT the drop as well with 235/60/14 BFG’s.  Didn’t have any clearance issues with tires in front at all.

I apologize now for being long winded.
The ride was slightly firmer.
The firmness is more from my shocks.
Especially on washboard roads...gotta go slower.

I had purchased an entire kit to install at one time.
I have following:  KYB Gas-a-just on all four corners, 1-1/8” front sway bar, 5 leaf mid-eye rear springs, 3/4” rear sway bar (recently removed due to oversteer), and 620 springs.

The coil springs were installed about a year after everything else, Why?
My thought at the time was to rebuild front end and install springs at same time.
I was still learning about the car and having the time/place/money to do it.
Take it apart once.

With the tired original springs (289) and KYB’s in front, the largest tire I could fit was 225/60/14 Kelly Chargers and those ran smaller than BFG’s of same size.

After 620 spring install and KYB’s, I was able to run 235/60/14 BFG’s.
My front end raised compared to my original springs.

Both were on 14x6.5 cragar wheel with 3.5” backspacing.
These wheels didn’t have enough backspacing for the tires I wanted to use.
Actually had very light scrubbing on one rear tire if I had passengers in back seat.
Backspacing is your friend!

All of above was WITHOUT Shelby/Arning drop with Granada spindles.

I finally performed the drop two years ago, since I was replacing ball joints.

I kick myself in rear for not doing the drop while rebuilding the front end the first time.
Handles way better than before!

I will be installing the correct ‘65 spindles this winter with the same suspension setup.

In my defense, we didn’t have internet to research information.

Bahahaha😂

Hopefully this helps.

Last edited by Nos681 (9/08/2019 6:58 AM)