Some new info--the cam in the short block that I purchased is NOT the F-288/4134-6, but instead the F-280/430-10. That's why the open and closing intake specs did not match up with where the cam is degreed in at. I'm doing some test-n-tune next Sunday and will set this cam up with intake centerline at 104 if piston-to-valve clearance permits. Should be fine, not looking for max HP, just consistency and durability, my motor rarely goes over 6K RPM. It only takes 450 HP to run the Super Gas index. Also, these cams are not necessarily what I've chosen to be the best for my application, they just happen to be the ones that I have.