I must have slept through cam school because a factory magnum cam is about 198*@.050" , .439" lift and 114 LSA which is probably just about what OP is looking for and wont ping on 89.
OP you failed to mention if this is LA or magnum but magnum is 9:1 with small cam and doesnt ping, its a hydraulic roller which is ground drastically different than HFT cams, they also work a whole lot better. Also dont have to worry about having enough duration to bleed off cylinder pressure.
