I have a '39 Plym conv coupe which I have been working on since I found the car sitting in a field in Montana.
I like cars that are reliable, safe, and can be used to drive locally and on extended road trips..
I did a lot of research on the options available to up-grade/modernize the mechanical aspects of my car... I wanted to retain the original looks of the car. Of course the Mopar purists advised me to put an early Hemi engine, or a 440 w/727 trans and a Ford 9" in the car if I wanted to improve the performance..
After much research I settled on a FatMan front clip w/power rack and 11" disk brakes.. FatMan is the only company that makes front clips especially designed for the Plymouths..
My engine is a 2002 350 CID 330 HP w/ 700R4 trans.. The rear end is a early Camaro/Nova 10 bolt, 8.3/4"... The rear end measures 54 1/4" backing plate to backing plate, 61-1/2" OD... The 54-1/4" ID measurement is the same as the original differential. I used Posie rear springs... I had to make special rear shackles "C" shaped because the original style open "U" shackles tended to rotate the spring.
My wheels are special made steel 15x7 with early spring clip type centers to fit my original '39 hub caps. Tires are P205R60/15 front & rear.
The car has PS, PB, AC, cruise & tilt. It drives like a dream cruising at 70 mph turning 2,100 rpm... Emergency stops and/or maneuvers are handled like any modern car.
My one regret is that I did not use a Mopar 340/360 engine... Maybe someday I will...Bill