My first new old chevy

[T-ravC10]

Hello guys so I just bought my first old new truck. This is my baby and I have a ton of plans for her. I also have a lot to ask cause I never had something like this to work on before. I am in the navy and have been stationed in Norfolk va. I bought the truck from a guy a little bit north of here she is clean no rust underneath. He did most of the work to the truck Like

Original engine was a 283, new motor dropped in at 72545. New motor came out of a 74 camaro.

Motor- 350 2 bolt main.
Bored .30 over, mains and rod bearings standard.
4 dish flat top pistons

Heads- Are a 462 cast 58cc chambered double hump
1958-About 1962 corvettes, (furie heads) with screw in studs, posi loc
rocker arms nuts with high performance valve steam seals.

Cam- Comp cam 272

Intake- Edlebrock performer

Carb- Edlebrock 650

1st gen- AEI distributor, after market with vacuum ADV

Rear end- 1974 chevelle, has new seals and fresh lube

spark plugs- are ap 85's (auto lite) or equvilant

plug wires- 8mm

Tranny- Is siginaw 35pd manual

Ignition modual- BWD CBE4P

This is some of he work he did on this truck and I plan on doing much more. Now I am trying to change the front drum breaks to disc and power breaks all the way around. The guy I bought it from had a set of 74 chevelle spindles that he had bored to fit the original ball joints and tie rod ends. I am trying to make this work so I can keep the spindles, and rims that are already on the back.
Some of the guys at napa have been helping me out but I would like some help from the pro's (you guys). The guys at napa have been hooking me up with 69 el camino rotors and calipers because they said that is what will work with the spindles that I have been given. I also really don't know what kind and where I should pull the break booster and master cylinder off of. Or should I just order one? Also if there is a need for a bracket to mount to the fire wall. Also what about a proportioning valve? Thanks guys for helping me out with this I really appreciate this.