Agusto - Take a look at the just released MSD Atomic EFI (http://www.msdignition.com/default.a...184&blogid=429
) About 2000USD, but a complete system.
Other then that, the Megasquirt is about the least expensive way to go. Their website has many, many pages for each variation along with a complete set of instructions.
I'll probably go one way or the other in the next year or so