OK, here's what I found. All measurements are referenced off of the crank flange surface where the flywheel bolts down. With a functional clutch disk installed and the pressure plate torqued down, the diaphragm fingers were 3.425" above the crank flange. The flywheel was 0.700" thick at the bolt flange, and 1.35" thick from the wear surface down to the crank flange.
For comparison to the Hemi, the mounting surface of the crank flange to the LA block is 0.6", and the LA crank flange bolt pattern is about 6x3.435" DIA. The 3.7L V6 crank flange bolt pattern is 8x3.137" DIA. I'd be interested to see what the Hemi's crank BP is, just so I'd know.
I hope this info helps you figure out what's going on, and I'm sorry it took so long to get to you. Keep us posted.
