SBC SWAP IN A 64 BARRACUDA?

Yeah, but if he wants a Chevy, get a Chevy.
The car will not look right, it will always look like a basturd. We're not talking about a street outlaws '69 Camaro with a blown Chrysler Hemi. It's not the same.
If he wants to do it, he doesn't need our approval. This is kinda like " Why does a dog lick himself, because he can."