The Jeep 4 cyl bell housing has the same bolt pattern (engine side) as the Vortec and other GM engines, (60deg V-6's & 4 cyl, Northstar V-8's).
This dates back to when Jeep used the GM Iron Duke 4 cyl.
The Vortec 3500 uses the NV-3500 trans which shares the same bolt pattern as the AX-5 used on Jeep 4 cyl engine.
Advance Adapters makes a plate to convert Jeeps from AX-5/NV-3500 to an NV-4500. I may have issues with input shaft length on the NV-4500 relative to the depth of the Vortec bell housing. But it's pretty close, so it looks doable.
