We had a similar 493 on the dyno a few years ago.
TF240’s, Torker II, big carb, 1-7/8 headers, XS282S cam…….made about the same HP/ci as that 505.
I had an RPM headed 505 that did quite a bit better(imo) than either of those.
But, it was a bit over 11:1, and used a 112lsa version of the xs290s cam(252/260), dyno headers……. And a 6bbl.
645tq/589hp