It looks like MSD have raised the bar on EFI retrofits with a new system (11/15/2011 or thereabouts) that they call "Atomic EFI" (Atomic EFI - Atomic makes EFI easier than easy). It appears to be the next thing to plug and play. Kind of a dumb name, but it does look pretty good. You don't even need a return line to contend with, only their high output, in line fuel pump. They also have a brand new forum on it. Pricing is about $2K which might be in line with where I want to go when I get tired of fooling with that carb. I do want some more of someone else's experience on it - too often been the guinea pig for now extinct products