I'm the guy doing the Audi 2.7t swap. It's probably the easiest engine to fit as it'll bolt straight up to a 5 speed transaxle and it's not too big. I haven't had to cut my shell at all.
Turbocharging a Boxster isn't cheap or easy, regardless of the engine so if you are only wanting 350bhp i'd probably be looking at the Audi V8 (will require hacking to fit it).
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