Stock weight distribution for various body styles - can you improve balance w/out drastic mods?

This is Ed Wogulius's 71 Challenger. 340, 4 spd, t/a hood, aluminum heads, cast iron ex manifolds, full interior, no a/c, power steering car..

Last scale reading pic (#3) is with Ed in the car.

That is F/R 56.4%/43.6% weight split w/o driver. (scale is just reading rear percentage)

F/R 55.6%/44.4% weight split w/driver

upload_2018-12-26_17-17-49.png

upload_2018-12-26_17-18-6.jpeg