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and would you believe it the impulse G200 and the pup G200 says have 2 different displacements lol...
Yeah...it can be a bit confusing.
The early Pups had only one engine that some manuals say is a 2.0 - and it is a 1.9 G200...and they put two engines in the early Impulses that some manuals say are both a 2.0 - but one is a 2.0 (turbo) and the other is a 1.9 (carb). The 1.9 is a G series engine and the 2.0 isn't. The 2.0 is in the same basic engine family as the 2.3 and the 2.6.
Nothing from the 2.0 will work for the G180 or the G200. I think it's kind of an oddball engine, because they only put them in the early turbo'ed Impulses for a few years. They easiest way to tell is the G200 has "G200' cast right on the front of the head and the driver's side (unless you are in aussieland - then it's the passenger side) of the block.
The 1.8, 1.9, 2.3, and 2.6 will all bolt up to a stock Luv 4x4 tranny/transfer case - but the 2.6 with the 2.3's carb intake and electronic distributor would be the best replacement engine if you are looking for a not-too-expensive power upgrade and clearly would be the cheapest/best bang for your buck. You would be easily doubling your hp/torque - possibly even more if you built it right.
Any other engine and tranny/transfer case combo would work too - but it's going to take a lot more modifying and time/$$ to do it.