The block was freshly redone when I had the engine built. It's got about 13000 miles on it now. As far as the induction being the same as a 2 bbl carb, my system is aftermarket. It has 1/2" larger I.D. runners and either a 90 or 100 mm throttle body. Way better than a stock system. It pulls like crazy up to 6000 rpm with no power loss like the stock systems. At 120 mph it is still slamming you back in the seat. Also it isn't MAF, it's MAP. I've just got to see if the change in duration from the flat tappet to the roller is enough to mess with the program they burned into the chip when they built the system. The cam I'm looking at is a Crane 119701 with 222/230 duaration@ .50 .519/.539 lift with 1.5 rockers, 112 degree lobe seperation. If the cam is wiped (I don't think it is, it didn't run more than maybe 1 1/2minutes with the lifter making noise) I will pull the crank and check the main and rod bearings. If there is any sign of damage I'll go from there. I rechecked the cam specs and also spoke with a tech from Crane and Edelbrock and it looks like the springs I have will work just fine. They will handle a cam with .036" more lift than the one I'm looking at. Thanks for the responses, Art