The guy you're buying the 90 from is crazy! You'll end up putting in 10 times the work to toss in a 4.2 or 2.7T.
Best/easiest motor swap for a early 90 is either the MC-1 10V turbo (found in a Audi 5000 or early 200) or a 3B 20V Turbo (found in a 1991 Audi 200) or AAN (found in a 92-95 Audi S4/S6). All three of these motors bolt right up with no issues.
If you're spending the time to do the swap, get the 20V Turbo. There is some CRAZY HP number getting produced out of 3B or AAN motors. Javad at 034 motorsports has a 3B with over 1000HP!! Simple chip and exhaust and you're already 300HP.
Anymore info you need on these older Audi's visit motorgeek.com
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