Aluminum Parts

My OE bell is aluminum, '73 Cuda. Cast iron/steel trans.

For a performance build, I'll assume your actually going to make over a true 450/450 powered engine, do not use a OE aluminum case trans. A modern trans case will be stronger and OK for some power. The bell can be aluminum though I would caution against it in favor of a scatter shield. (Your) feet are good to retain in a God forbid..... A. Aluminum or lighter driveshaft is a good move. I do not see any real advantage to an aluminum flywheel. After all, this is a street vehicle right?

Build for longevity and worry not about weight here.
For a race car, the reverse is possible with longevity because the whole package is made super light.