Depends on how much money you are willing to spend.
.043
.43L. 1000ml=1L
There is no adjustment required, but you can clean it with a carb cleaner.
Use an exhaust made for an LT1 engine the blocks are identical it is the insides that is different. Will bolt right on.
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.
4L60/E l
1993 CHEVROLET K1500 PICKUP V6 4.3 (262) Z GAS engine 4207 PLATINUM PART Gap=.035 4449 PLATINUM+4 Do not Gap HR9BP PLATINUM PLUG Gap=.035 4302 PLATINUM2 Do not Gap HR10BC SUPER PLUG Gap=.035 7585 SUPER PART Gap=.035
43L of 18-k gold
Yes it will bolt right up to it.
There is one before and one after the catalytic converter.
The fuel lines around the filter; you will need an adapter.
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