Help me sort my combo

Are those original A body big block exhaust manifolds? If so, you might consider selling them for big bucks and buying a set of high quality headers such as the TTI 1 3/4 inch. That should free up some cash and some power at the same time.

If it was my car I'd probably get rid of the 509 cam and switch to something like the Mopar .528 solid or maybe even a touch smaller than the .528 solid. It is easy to over cam an engine and if you aren't super sharp with the carb tune then the car isn't much fun to drive. Another option would be to ditch the carb and to put a Holley Sniper throttle body on there. If you are interested in tuning the Sniper will be a lot of fun. You'll be able to watch how the engine works with the Sniper data logs and you'll be able to tune it with a laptop rather than a screwdriver.

If you insist on keeping the exhaust manifolds then you'll have to change the cam. That cam sucks with cast iron manifolds. If you want the engine to run hard with the manifolds then you'll have to work with a cam guy who knows what to do with manifolds. Porter Racing Heads is the only guy I'd trust if I wanted to pick a cam to work with manifolds.