4 barrel carb swap and some head work

Nice. What grind cam did you get? My slant has the Offy, had the Holley 390 and big valve head shaved about .050" I have the 264/440 cam.
If I recall with my setup my primary jets were 56-58, secondaries were 64ish, yellow secondary spring and a power valve that opened fairly early. May not work for anything on yours, but that is where you could start if stuck. Good luck and the engine looks great!