my 65 service manual only gives lift, .375 intake and .360 exhaust. my 69 service manual has 240 degrees .395 lift on the intake, 236 degrees .395 lift on exhaust, 16 degrees overlap. an engine manual i have says 1971-1977 was the best production cam at 244 degrees duration, 26 degrees overlap, .406 lift on the intake and .414 lift on the exhaust. looks like 71-77 are the hot ones, .