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October 8, 2020 at 11:23 pm
#218190
If I was in your situation I would bolt up the NOS head you have and run it. In my mind, a 55 cylinder head and a 55 cylinder block should give you the results you want.
When you put it together with the new cylinder head, spin it over slowly by hand with no plugs in and feel for any resistance or things hitting where they shouldn’t. Then put one plug in and repeat. Then take that plug out, put the other one in and repeat. That will give you the peace of mind that nothing is hitting.
All of those heads mechanically should interchange, the only difference would be what cowling mounts they have