Here is what my 4.0 has:
Hesco AL head milled to get me to just under 10:1 compression ratio. Hesco pushrods, Hesco H264 cam, Harlan Sharp roller rocker kit with Hi perf valve springs, late model manifold swap and load tuned on a Dastec dyno using a Unichip. Didn't get 40HP... more like 27. Did...