Well a stock WC is right at 30HP so going with a WD45 will bring that up to around 45HP just stock. Now if still want more and have the $$ to play with you could take that tWD45 engine and do an over bore sleeve set, mill the head and maybe do some carb work. If you really want to go hog wild find some one who can port and polish the head for you and that would open it up a good bit more but that also cost your some big $$. A simple polish job one can do with a simple demail type tool and some time
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