I'm using the Comp Roller lifters, but only 700# open pressure with PAC1325 valve springs 0.714" lift cam, 1.950" install height (about 275# seat pressure.) I may have around 500 miles street/strip on them, and I usually shift around 6,500 RPM. I originally used 0.083" 3/8" pushrods, but upgraded to 0.120" wall.