I saw a genuine, factory, never installed full pressure 235 crate engine sell once.. a guy had loaded up on stuff out of a GM dealership that went tits up in the early 70's and had a boatload of New, Old Stock stuff.

The 235 sold for big league cash. Barrett Jackson kind of money.

Your best bet, unless you come from an affluent family or are a world famous cardiologist or neurosurgeon would be to go with a reman engine, or take yours to somebody and have it rebuilt.

an idea is only stupid if you think about it rationally.