2.0 to 2.4 is easy. 2.4 to 3.0 is possible, but costly. 3.8 will not be easy either (i think).
Five quarts including filter. My owners manual says 5.75, including filter. My experience agrees with the extra .75 quarts! :)
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.
on the crank behind the front cover
Not very easily if at all, and why would you want to?
it's located on the firewall right in back of the intake
A haynes manual...
They always blow the head gaskets between 70 and 100 thousand miles.
3.8 litres is fractionally more than 1 US gallon.
You can safely put 2ml into the 10l aquarium
If you mean 3.8 Litre engine, the answer is 200 horsepower, from the factory. 225 lb/ft of torque.
there should be a sticker under the hood of the car that tells you what the gapping should be. .60
There are 460 CID engine swap kits on SUMMITRACING.COM. The 460 is the building "block" for several larger stroker motors. It will take a lot of work. If you have all the necessary parts, it would take the average mechanic at least 6 weeks. Likely more. Unless you're going for a strictly track vehicle, you'd get more bang for your buck with a supercharged 4.6 or 5.0.