Hello-
For the tranny, the ideal choice would be a G86 - the Boxster's transmission. Get one from a Boxster S - it has 6 speeds :-).
The engine? Well, I guess anything goes. It depends what you want :-). If you want to keep aircooling, go for a T4 or 911/964/993 engine. Note that some modification will be necessary to the G86 bellhousing (not the same as aircooled VW/Porsche), but probably nothing that couldn't be overcome. If you don't care about aircooling, then just about anything goes, I suppose. How about a W8? :-)
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Shad Laws
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