and then
you find out that with the stock cam, your Dynamic Compression ratio, which is the ratio that the engine actually understands, is too high for even best pumpgas, and so, you gotta pull timing out, and the engine ends up making no better hp, and the torque at Part-Throttle is down, and it now sucks gas on the hiway, because of the retarded timing.
But, I suppose, you've figured all that out, right?