" This is something I have thought of heavily on my car.
yank gas tank and rear axle. Obtain shortened Ford 8.8 axle with some 4.56's, Eaton E-locker, diff support.
build a subframe out of the RTAB pockets, and triangulate to where the front subframe mounts were.
make a ladder bar system with a watts link to center it.
coils would still be in the same place, and have coil buckets on axle= easily hung and sprung.
move shocks inboard to the trunk, build a shock tower brace from tower to tower to mount new shock locations.
Murder a 60'...... like a 1.3 or better now that you have a serious axle, can tune shocks for launching, and can make rear anti-squat adjustments with the ladder bar to make the rear "dig" and transfer weight.