Is that a solid roller? I've got a straightline solid flat tappet cam with 248/260, .555 lift that I really like. With e-heads& flat tops (10.8:1), m1, & 950 it made 571hp & 573tq. I've gone 10.93 at 3700 lbs w/ 8" converter & 4.10's. That roller of yours sounds like something my motor would like.