It could be the 160 or 180 HP 4.3L TBI engine, probably the 160 HP engine.
Use an exhaust made for an LT1 engine the blocks are identical it is the insides that is different. Will bolt right on.
There is no adjustment required, but you can clean it with a carb cleaner.
.043
.43L. 1000ml=1L
4L60/E l
Yes it will bolt right up to it.
43L of 18-k gold
There is one before and one after the catalytic converter.
The fuel lines around the filter; you will need an adapter.
What year is the gtp, if 95 or newer yes, if gtp is in the 80's then no due to pollution restrictions today, and may have to change the computers from each vehicle. Each computer is set to specs for the engine it controls.
remove the intake hose and the exhaust port screwed into the egr valve, the remove the two retaining bolts from the intake and clean any old gasket material away. if possible run a piece of wire down the hole to make certain the passage is clear of carbon build up
It should be on the front of the intake manifold directly above and behind the water pump.