Thanks for all the info, everyone! I have a 2843212 flywheel, which, I believe, is an 11 inch, 143 tooth unit. Someone mentioned it was "neutrally balanced", and someone else said that it is likely an internally balanced one.

Then, the crankshaft apparently "might" be a pre-1962 crank which is no good for going in anything post '62. Also, there is a possibility that it might be an "extended flange" unit, which wouldn't work either.

Holy smokes, am I ever confused. I'm going to go look at the thing today and see if the bolts match up 'twixt the crank and my flywheel. If I'm still not sure, I'll just get LOTS more pictures and ask for help.

Thanks to everyone up to this point!
- Steve -