Flywheel 122 Tooth

here's the clutch a lot of us run

https://www.summitracing.com/parts/zzz-mu1525-1/make/dodge/year/1965
it's more than adequate for moderate HP applications and if you're not drag racing.

i wouldn't worry about it exploding with a cast iron bell, that should contain it.

besides, you'll probably break something else in the drive train before that happens.