66 Valiant Signet has a 360LA engine - what do I need to know?

I agree that the flywheel looks and weighs like steel. SFI? Hard to tell without markings. As far as the holes drilled in it - your judgement is way better than mine. And I do believe that it was put together right - but I want to know what you all know, what to look for, what's right. And I don't want to do it twice. Thanks for your input.

Jim