Best next upgrade?

Got a hold of this 69 FB barracuda a few months ago and the P.O. did a few upgrades.
318, rebuilt/ bored .030 over, edelbrock performer plus cam ([email protected], .420 lift, 110LSA). Edelbrock Performer intake, 600 carb.
675 factory heads
Mopar electronic distributor with orange box.
904, rebuilt, stock converter
7-1/4 open rear with 3.55
Dual exhaust with stock manifolds.
14in rallies with skinny radials.

So far I’ve put an electric fuel pump, headlight relay kit, new front engine and headlight wiring harness, replaced sagging rear leafs with “super stock”, re curved distributor, rebuilt carburetor, fixed some general electrical and interior problems.

Now I’m trying to decide where my money is best spent on next performance upgrade..
Headers? More cam? New heads? Higher stall converter? Posi? Wider rims/tires? EFI? 8-3/4?

I feel I’ll end up doing most of the above over next few years, but which would y’all do first? Which will give the most “smiles per mile” understanding that stuff will get done incrementally…