so anyone have experience with the 320/533 hyd

That was the first cam I was going to use (even though it violates my hydraulic lifter rule) back in 2014. Back then there wasn't one to be had. Couldn't find one in the entire country.

So I said piss on it and used a Racer Brown solid and never looked back.

If you can find one you need a minimum of 3500 converter, at least a 4.10 gear and a good single plane intake to make that cam happy.