Elongate the pushrod holes or you will have pushrod binding. If I understand the post correctly. you have a 455 again? I would find a set of 6X-4 with that cam and needing some 9.5-1 compression heads and install a set of SS 2.11/1.77 valves.
You don't want the 455 with RA III type 72 cc senerio heads unless you plan on running race gas all the time. Over 11.5-1 compression with an iron head. Ouch.
It should fly.
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