There is NO DIFFERENCE in power/manual/drum/disc pedals.
Get the Factory Service Manual for free over at
MyMopar.com . It has the spec and procedure for setting the push rod length correctly, as well as anything else you need to know about your car- right from the folks who designed it. Not from an anonymous internet source.
Possible. See above. Drums normally will be warm after use.
Brake adjusters are side specific. Make sure you have them assembled correctly and on the proper side.
They only adjust in reverse, and could take quite a bit more than one trip down the driveway, dependent on how far out of whack the original adjustment was. Manually set the adjusters so you just begin to feel a light drag when you rotate the wheel, then go about letting the self-adjusters do their thing.
Several things you did not mention that could be contributing to your issue:
What size master cylinder are you using? Did you use a proper drum/drum master with both residual valves still in place?
What size wheel cylinders did you put in?
There are multiple sizes of both; parts sources are getting notorious for incorrect part number listings. The FSM and part catalogs will tell you what was originally on the car.
When you say you installed a "repro disk brake booster", is this an actual replacement part or an aftermarket "Fitzall" unit that is non-factory?