External parts are pretty much interchangable ( intake manifold, heads, exhaust, water pump ), although anything having to do with air/fuel in or exhaust out will work better or worse depending engine size, flow rates, etc. , but they will all fit. Internal is another matter. Pistons will not, different bore size. Crank I believe just off the top of my head is a different journal size, so won't. Cam will, but you should look at the cam specs to see if the cam swap wouldbe beneficial. Hope this helps.
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