A good used pair of Ford FE 427 MR Medium Rise C5AE-6531-A rockershafts. These are specific stands and shafts for the 427 MR and Tunnel Port heads. The stands are approximately .090" wider and the oiling holes in the shafts are spaced to accommodate that extra width of the stands.

What you see is what you get, there is no return. Free shipping to the lower 48 states.