How wide is the gap? I have seen some of the mismatched sets have a small gap and have used a washer as a spacer between the two to keep from bending the uppers when the bolts are tightened.
Spacer idea might not work as the are also different heights from the block to the cross hole, making the span from one side of rhe motor to the other too wide or too narrow to even get the bolt holes to line up with the frame stands.Mike H said:Make a spacer and weld it in and run them.