I had 2 AMC eagles with inline 6s. One was auto and the other a 5 speed. I don't know what size they were. Neither was impressive. I had 2 Jeeps with with 4.0s and liked them both a lot. I might still have them but my wife rolled one and we hit a horse with the other. I think if you could find a donor so the wire harness and computer were there an EFI 4.0 would be fun. I had a Datsan 810 sedan with an Inline 6 with EFI and a 5 speed. It was very impressive. Although I do lean to the GM in a GM thing.