Can anyone tell me what engine will bolt up to replace a 2.5 in a1985 cj 7 it is stock. I would like to go with something a little bigger 4.0, 4.2 or 4.3 v six. I can not seem to find out what will bolt up with the least amount of trouble? and if I went back with a 2.5 out of a newer jeep wrangler would it have more power than the original Thanks :usa: :beer: :confused: