Hi,
Twisted 6 is right on the money on the HP rating. I did similar mods but only .040 over, Ported & Polished, 3-2's, 270 Wolverine Cam, Chrome moly rings, fluid dampner, Comp Cams Rockers, synthetic oil, water heated intake, 11" flywheel, and Corvette chambered pipes through 2 1/2" exhaust. My motor dynoed 274HP at the flywheel. More important, I've got gobs of torque and a low 1st gear (4:1) for great all around performance.
