If an EFI is in your future, why not just buy a Holley or FAST self learning EFI setup instead of a carb and intake setup. I know they run about $2000 but the cost of a carb, intake and HEI is not trivial either.

I put a Holley HP EFI on my 355 and it is a running fool. There will be none of the worries you have with rich issues and the performance and milage will be better.

Just sayin'

Bob