Yeah, my plans are to use the Gen 1 transmission...for now. But I do fully intend to use the Gen 2 eventually, maybe even pretty quickly after I get the engine going. I like to "compartmentalize" projects...get one thing working, then the next, then the next. But as it stands, the rear face of the engine (where the bellhousing mounts) is in the same position as the 3.0, I didn't try to move things forward or backward.

The mounts are pretty easy to make as long as you have the Gen 1 engine brackets, Gen 1 rubber mounts, and Gen 2 engine brackets. When I cut the triangular part of the mounts off the Gen 1 brackets, I cut the weld right at the engine plate...so there's really no change in their "length". If you look closely in the pics, you can see that the joggle in the Gen 1 triangular piece goes perfectly around a bolt on the Gen 2 engine plate...and on the opposite side of the same triangular piece, the side is shorter...but there's a bulge on the Gen 2 plate that makes up for it. It's almost as if the pieces from the 2 generations were meant to fit together. I don't exactly have any measurements, I basically just used my truck as a welding jig...which I suppose I could do again if needed.

Ok, I also had another thought...
One might be able to use the additional length of the Gen 2 transmission to their advantage for a v6 turbo setup. If you mounted the tranny so the output is in the exact same location as the Gen 1, that would mean the bellhousing would be forward quite a bit... I guess it's 6 of one, 1/2 dozen of another...easier to mess with driveshaft lengths? or engine mount locations?