770 oliver block

I've seen many taken to 4 inch but in my opinion it ruins the engine being hard blocked . maybe there's another way .
 
it will go to 80 hp by just 12.5 compression and breathing . you shouldn't need much more for 3.5 mph pulls
 
Thanks!! 125 shaved from the head 3 3/4 with flat tops bullet cam big carb and intake just want some more power a guy told me off set grind the crank to 1.75 and use farmall C rods any opinion on that thanks
 

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