This is my self etching primer and hemi orange Duplicolor engine enamel process that is about 6 or 7 years old now with thousands of miles and many passes.still holding up well.
Without you knowing all of the specs of your engine it is just a guessing game for us. If the so called rebuild is just a gasket job and repaint on a later smog 440, your horsepower is way less than the 385 you think with only 7 or 8:1 compression. Sure, a 3000-3400ish converter and 4:10 gears...
Hmm, I have always just dumped them in a 5 gallon bucket with some cleaning solution for a couple of days and they come out looking like new. Then throw them out in the sun to dry.
Nothing wrong with Comp. Yes, you hear some horror stories once in a while. You hear those horror stories about everyone's product eventually if you build enough engines. We build a couple hundred engines every year. Most with Comp Cams camshafts with no issues.
I have done it on a couple of my cars over the years. It was all custom made by me. Nothing of a kit except a factory 440 sixpack base from an A12 Bee or Bird.
Are you sure it is lifters and not the rockers clattering? Did you re-install the rocker shafts correctly on correct side from front to back with the oiling holes facing downward towards the #4 cam journal.
I have an am/fm in the car already. I also have the 8 track bezel pieces and 3 speaker dash speakers and grilles already also. Just need to find the radio.
It is insane what people are asking for these factory radios these days. I have been looking for an 70 AM/FM 8 track radio for a while myself. Even if I can find a core to update with newer and updated internals is even difficult to find.
Welcome. Nice car. It looks like it was expensive. Good luck with your Son on the new project. Being the Father and Son project aspect of it is more important than the style or type of car itself.
Looking good. I owned a lime green 71 Challenger at one time also. Actually, I owned the same car twice and regretted selling it the second time as well.