People have been able to fit 3100 SFI's, 3400 SFI's, and the 3800 SC's into our J-Body's engine bay... The best bet would probably be the 3400, since it requires less fabrication than the 3800.
Read the sticky threads at the top of this section for some good information on 3100/3400 engine swaps. There's some things you need to know about doing them before going out and getting engines. A lot of guys (Raven and Colin come to mind) who will tell you that you can't just drop in a 3400, and encourage you to build it up first to get the best results.
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