Hinoonaz,
The problem I have with many of the EFI kits is they do not come with a built in pressure regulator. This adds at least $100 extra cost. After much study, I bought the Holley Sniper EFI from
www.efisystempro.com. They are more knowledgeable than anyone about these systems. Plus they run discounts that can really help.
I had a small tuning problem getting my idle speed set right and a quick read of their tuning section and a piece of tape solved the issue quickly.
I have just documented my install on the topic "EFI Anyone?"