1) The existing ignitor / distributor setup is going to work with EFI only. It's designed to provide and accept signals from a computer.

2) Use a 22R distributor / ignitor setup. If you get lost, there is a way to use Chevy parts with the 22R distributor - the how-to / post is over on pirate.

3) Fuel delivery. The existing 22re fuel pump is turned on by grounding a switch at the AFM - when the flapper opens. You'll have to work around that. You need a by-pass regulator or you'll be pushing 70+ psi of unregulated fuel into a carb and will definitely blow it out. The regulator should be a by-pass type, under 5psi, and should have a return.