the 2.0L aba from the mk3 w/obd1 is definetly a nice choice, especially for what you want to do. very tough engine, doesn't weigh much, and can make great power with a turbo even with stock internals. I heard you can also use the engine management from a g60 corrado if you want to make a "junkyard" turbo setup rather than buying a new expensive standalone system.
Enjoy and happy hunting
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