The best way to swap engines in my opinion, is to get a DTM shroud from Jake first. He has conversion kits in differnet stages for this swap. This is the best way to convert. Then you need dual carb's and electric fuel pump plus some kind of exhaust system, as the bus stuff won't work in a bug swap. Before you go asking or buying anything for the swap you need to know what year bus it is. I belive the type IV motor started in '72 and went thru '78 or '79 not completely sure on years, but motors went from 1.7, 1.8, and 2.0 thru the years.
P.S. If you don't know who Jake is, you better start reading his site before you do anything else
www.aircooledtechnology.com
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG