I am putting a 68 400 motor together. I have 68-#16 heads that I am in the process of setting up. The car has a richmond 4spd and posi carrier not sure of gear ratio. Reason I ask about the cam specs is I don't know what the factory grinds were. I know some have mentioned using such cams but I want something with a noticable lope. I want to compare the lift and duration of factory and aftermarket to pick the best cam for my application.