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Lycoming 0290 help

:fishing just bought a little boat with a 0290 lycoming and would like to find some more HP if possible boats runs great just always want more any advice would be appreciated
You could put 180 rods in it and also get a set O-435 angle valve cylinders with Dome top pistons plus a 200 wide lobe helicopter cam but it will be a Avgas or race fuel engine with a 100 plus octane fuel. I built one about 8 years ago and the thing ran like a rat on acid! It was a strong little motor