Re: 4 inch crankshaft
It's your money. If the engine price is considerable it would be wise to remove both heads. As mentioned check the stroke, but more important look very closely at the valve to cylinder area for cracks. Unless someone has installed a merc crank and pistons it will be a 3 3/4" crank. Nothing wrong with the 3 3/4 crank set up, just fewer cubic inches.
Enjoy
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