I did a Caviler rack on a 39 Plymouth several years ago (maybe 10?) The article above would have solve the few issues I encountered. I also upgraded to disc brakes (my original drum setup was toast). Also move the upper shock mount. If you want to lower the front end, the front spring uses a mounting plate on the lower control arm, the plate is riveted to the top side of the control arm. If you remove the rivets, you can move the spring bracket to the bottom instead of on the top of the the control arm and effectively shorten the springs without cutting them, by 1". You will need to replace the removed rivets for plate on the underside of the control arm with grade 8 bolts.

I know you were requesting info for the front suspension, but also consider updating the rear axle, brakes, and possibly the rear springs as well. Gene