Here's the deal, i have an 87 cherokee, 4.0, aw4, 231, w/ 8.25 that I swapped in. At 285,xxx miles my motor is getting tired and i bought a 1999 4.0 with 45,ooo miles on it for $75. I have everything adapted to make it run correctly with the '99 head , intake, and exhaust manifold. The only...