When we made our own rockers I looked into this a bit,we measured lift on both the lifter and the valve and ended up with 1.42-1 ratio with 1.7 rockers
This was with 59* block and .900 offset rocker...
just a thing to consider when you choose camshaft

-65 Valiant,420", all motor,2700#, dot tires, 8,42 @ 160,2