Why not just convert to an EFI tophat type injection. Might take some fabrication, but it would be way cool and you would probably get it to run alot better on the street. Couple of sensors from the junkyard, a new WB sensor, Genboard V3.2, some time building a harness, and you are on your way. If you are injecting before the blower, it should tune just like an NA engine.
Chris