The folks at Weiand are correct, the B&M 142 will bolt to the Weiand manifold. They neglected to mention that the B&M is 1/4" shorter than the newer Weiand. I didn't pay enough attention to the Weiand dimensioned drawing, or measured wrong?? but the bottom line is that the supercharger drive pulleys did not line up. I mocked this up four times and measured 25 times and nothing changed.....
.222 inches out of line.
That's not all, the new V-belt pulley set was .145 out of line also. Water pump and alternator pulleys were .145 behind the crank pulley. Two unrelated systems and 5 pulleys, all out of line.
It took a lot of talking, but I finally convinced the machine shop to machine the new harmonic damper for me. I had them remove .145" from the nose and reinstalled the water pump/alternator/crank pulley assembly and that aligned the V-belt drive.
Mocked up once more and then had them remove .072" from the back of the Weiand crank pulley. All is lined up correctly now. After fabbing an adjustable Idler mount, I think it might run.
Measure 25 times.......cut once! The new harmonic was identical to the original beat up 327 Harmonic in every respect.