Its been a few years but i did go from PRW 1.65 to harland sharp 1.65 with OF cam. Rechecked pattern and pushrod length 1/2 lift method. It was slightly different but not enough to warrant new pushrods. Its been running fine FWIW
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports,
3" pypes, Hooker 1 3/4" headers, hydraulic roller,
10" Continental, 3.42 gears
11.5 @117.5mph 3900lbs 
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