I'm currently converting my 4 banger to EFI using a Megasquirt ECU and Suzuki GSXR throttle bodies.
Total costs will be less than $1000AU.
Two sets of these TBs would look great on a V8 and at only $100 a set real cheap too.

There is a new book coming out soon on hot rod EFI systems
http://www.hotrodhandbooks.com.au