Which are the plates you have to locate the motor to the "correct location"? Are they specifically meant for an AD truck on an S-10 frame, or are they for an S-10? The reason I ask is because those 2 applications need the engine in much different locations.
It's possible you might need a longer frame mount on one side, I don't recall how symmetric the S-10 crossmember is. Since you have the engine, it seems logical to check the parts you have and see where the issue is.
