I think you'll have to find a pre-87 Mitsu/Dodge pickup truck that had the 4g63 sohc motor to find a transmission case to fit yours, and swap in your tranny internals (I "think" this will work) and tailshaft housing. The motor mounts are the easy part, and the 2.6 mounts may bolt right up to the 2.0, or be easlily modified (whiz wheel and welder) to fit.

However, I think it would be easier to sell the 2.0 and fix the 2.6 and turbo that, and I don't think you'll be happy with the results of loading a 2.0 with that much mass...

Not responsible for advice not taken...