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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



My w5 motor was spot on the camcard lift with Harland sharp rockers. Exactly 0.643 on intake. dont know if Hs take the angle of the pushrods in calcs when making their rockers, but they are equal in lengths with the ex rockers so idont think so.