Re: EFI / MPG question (poll)
I think I agree with what My427Stang said, and thats basically to tune what you have. It would be a fun challenge, and if strictly saving money is your goal, probably the cheapest way. The other way that I would suggest is to find a wrecked 96-01 Explorer 5.0 2wd (not very common, but they are out there) and use the whole engine and trans. It has good flowing intake and heads (basically 93 Mustang Cobra), small truck cam (good low end power), and a deeper 1st gear than the older AOD for better acceleration and better city mileage. I think you could have a complete engine and trans with harness and computer for $500. With that particular combination I wouldnt try to mix and match too much since the trans is electronic and would require a fairly pricey stand alone computer if you wanted to, say, use a carb instead of the EFI. One potential obstacle is the relocated spark plugs, but for your car special headers are readily available in the $300 range. Im not sure if the 2/4wd transmissions are the same from the tailhousing forward, but if they are that would make finding a suitable candidate much easier.
65 Comet wagon, 60% of the time it works every time.