X, B, or E??
I'm not a 100% sure, but I think that the E-303 cam is the only one out of the three that you mentioned, that you can use without needing your pistons fly cut. I run the B cam w/ 1.72 rockers and love the set up. My motor pulls hard from 3000-6000rpms. My pistons have been cut though, during the build up of my current motor.
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