Feel like my 440 should be faster

I am no expert but few things stand out:
-Thats low comp for a built motor
-Stock heads complete waste of time doing cam etc very minimum need porting and polishing, also port match all your items you would be surprised how badly they often line up. Old heads have very small ports get an old bloke who knows mopars he will know exactly where they need a tickle
-Gears are waaaaaay off, they are hwy gears for getting fuel economy, go 3.9s. Diff gears make more difference than any other modification
-Your stall sounds way out as well, stall cam and gears all need to be working as one. I had my stall custom built to suit cam and gears