Anyone know the origonal cam specs (dur., dur. @ /.050 & valve lift) for a 1970 351C 4V as in a Mach 1? I am running a Comp Cams 280H Magnum with 230 degrees @.050 and .530 lift 110 degree lobe sep. Is this less cam than factory? What is the hot street cam for this engine? mine idles great with strong midrange and not enough top end. Stock 4V heads and intake, hooker comp headers, holley 750 vac sec carb.