I have the Meziere flywheel and starter on a KB hemi, I use a chevy starter and have drilled and tapped the block on the pass side.
The starter itself is a 12 unit from a toyota camry 2.2 diesel or something like that and the selonoid is the only thing different in the 12 and 24 volt starters...
I just put me old RCD starter on the scale and it is 37.5 lbs and RBS superchargers list a new one at 40 lbs.
So the new and old models are pretty close