The only limitation is how much $$ you have to spend.
Unlike what is mentioned below, it is no more complicated to put a 3.8 into a car than a 3.6. And no more complicated to put a 3.6 into a 2002-on car than a 3.4 into the earlier cars. It is when you start crossing the boundaries it gets complicated.
Try the search function, these questions have been answered several times.
Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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