Ok so I can pick up this turbo for about $500 and want to know if on my 20b FD it would be "too much" . It will have a full stand alone, 1600 secondaries, duel fuel pumps, large 3 row greddy IC, and anything else you guys recommend.

Its a garret Air research Model T18A40 or Thumper.
Cold Side:

43-Trim Compressor Wheel
3.271 in. ( 83mm) Inducer
5.000 in. (127 mm) Major

0.96 A/R Compressor Housing
5.5" Inlet, 3.5" Outlet

Hot Side:

55 Trim Turbine Wheel
3.775 in. (96mm) Major
5.092 in. (129mm) Exducer

1.14 A/R Housing
Large Frame (Thumper) Inlet
5 in. V-Band Outlet

The motor will be rebuilt, ported, and then installed in the car.