A thermostat is only $7-20 depending on the name brand.
The site http://www.gmpartsdirect.com lists a new "instrument panel, crash pad" at $435.40. You can usually find them at junk yards for much less.
Enginge Oil capacity (quarts/liters) 3.5L V6 - 4.5/4.3 3.9L V6 - 4.5/4.3 5.3L small block V8 - 5.0/5.7
there are inset slots on the pole holders. these slots are flush mount and can be pushed in with a key
Depends on the engine installed. Starts with the Blue Flame 6 cylinder that had 90 H.P. and goes up to the 409 V8 with 409 H.P.