Had a 505 on the dyno yesterday....... pretty similar build to what the OP has outlined,
The one here would be a tad milder.

We used a Brawler 1050 downleg on it-
https://www.holley.com/products/fuel_systems/carburetors/street_strip/parts/BR-67209
After a few rounds of jet reduction, it ended up in the high-12’s/low-13’s at WOT, and 13.7’s or so at 3000rpm(50-70 hp)part throttle cruise, with 82/90 jets.
That motor only used 820cfm@6300.

That carb seemed to be a pretty good match for that build.