pat, if you ask those questions separately you may get more answers. For your drums, put a wanted ad in the swap meet and you will find some. They are differant than the '51- up bendix brakes, but you can swap 51-up brakes on there if you change the backing plates (and/or the whole spindle from the kingpin out).
Your parking brake pedal needs fixing. The mechanism that locks it works kind of like the one on a bar clamp and won't work right if it's rusty or oily. Take it out and clean it up.
The battery drain can be a lot of things. Disconnect one thing at a time until it stops draining. Suspect your alternator if it isn't hooked up right and none of your lights are staying on.
I've heard of people using VW motors but I still use vacuum in mine and it works fine if you get a double acting fuel pump or swap a belt driven vacuum pump on from a turbo volvo. I like the variable speed.
