Blueprint crate engine

Okay.
I don't think you'll break that with a 408 and auto (I'd look into a later model aluminum case 727, in place of your iron case trans, I wouldn't even bother looking for an adapter). But I'm also willing to bet that ....
1. There's not much gear in that rear, and
2. There's no suregrip in it.
So, one wheel peel for a couple hundred feet, with a b.p.408.