I like the efi/megasquirt idea. I like it so much that I'll let you in on a secrect. This is my plan for my 470 stroker! To this end I have already collected one chev tbi off a 350. My cid demands 2,so Im still looking to scrounge another.
Holley makes a 4bbl throttle body that flows 1000CFM, and they are cheap used on eBay because the computers always take a dump, or people can't figure out the system. This would also give you the idle air servo and throttle position sensor.