Here's an option, but makes you pucker a bit with the price

https://cokertire.com/firestone-wide-oval-radial-redline-hr60-15.html

I used Hushmat in the top of the cab, inside the doors, and behind the fuel tank on my 66 F250.  Seems to make a difference.  The floor has the original "rubber" mat, so I didn't alter that.

Hi Doug.  I think the OEM stands are always deformed after installation, as they clamp the shaft.  Look at the OEM 427 stands, that were beefier, but had a bend cut on one side to allow bending.  I think you'll be fine with the ones you have, though you might have to use a soft mallet to install them.

FPAs fit fine on my 66 Fairlane GTA convertible with a Borgeson steering box.  Custom lines that run along the block to the GM-style pump.

I have a Reactor Products flexplate in my race car.  Billet aluminum.  Been trouble free.

I went through all this along time ago. I had a ranchero, even lighter in the ass end. I did everything everyone is mentioning: 90/10's, Caltracts etc. The Rear tires wer 28 x 10.5 on Weld 10'' with 5.5 back spacing. To get them to fit there is about 2" between the inner wheel tub to the frame. I cut the 2" out and with some clamps and heat did a mini-tub with stock wheel tub pushed toward frame , then welded. Also did some grinding to wheel lip. All fit no problem. Was much better after that. Here is the golden ticket I share. An older timer told me to get some crap rear shock that sag. I believe WTF was my answer. But I listened some more. Also said to get a pinion snubber. Let the ass end sag, weight transfer to back and get the bottom of car to drive the snubber into the earth. That solved all my issues. Food for thought.

Doug aka pumpbldr
Precision Oil Pumps

I remember seeing your Rancheroi at a FPP show back in the 1980's.  Seemed like you had it well thought out and the car (truck?) was put together really well.  Are the rear springs farther inboard on a Ranchero than a Fairlane?

Seeing all the new tech with superchargers for the late model engines, but have never seen a Whipple or Kenne-Bell supercharger on a FE engine.  Would it be that difficult to do, or is the Paxton-style and Roots blowers just that much more straightforward an installation?