Budget EFI Kit

I am very Interested in this. I can't afford to go fast, so good reliability and fuel ecomomy are what I need. I like driving my car, but not at the price of gas right now @ 18 mpg with my TQ.

I have two questions,

does the fuel system require a return line back to the tank?

I have a stock cast iron singleplane 2 bbl manifold and a stock cast iron 4 bbl spread bore manifold. Which would give better performance with the TBI?

RogerK,

TBI does require a return line but you can add that fairly easy, as for the sending unit a piece of copper 1/4" return line can be soldered into it

the best for the TBI would be the 4 barrel intake, it would bring you more gains as well as its easier to make an adapter for

thank you for your interst