Took the adapters to a machine shop to get them "thinned" out a little bit. I measured and I need more of the input shaft into the flywheel pilot bearing and more splines into the clutch disk. I'll gain almost 1/4" by careful metal removal. Then, it's just bolt 'em up and get it off the jackstands! Nothing else could go wrong....right? Hmmnnn, we'll see.