387” W2 Stroker, What should I upgrade next?

Here’s the setup:
72 Duster
727-3600 stall 9.5 converter
3.90 gear/27” drag radials

387” W2 headed 360 based stroker
Closed chamber w2 race heads
JE forged pistons
Not sure on C/R but I believe it’s considerably over 10:1
750HP Quick fuel double pumper on 1” open spacer
Dual plane weiand intake (rare)
Small ish solid cam (most likely under 230 degrees at .050 and roughly 500 lift)
Small 1 5/8 LA headers adapted to fit the W2’s, 2.5” duals
35* total timing

Car runs good; feels like a mid-high 12s car but should have a lot more left in it, so what should I upgrade next? I was thinking single plane intake mani, bigger solid cam in the 250-260 degeee duration at .050 lift and 575-600 lift and 1 7/8” tti headers to really wake it up.
I suspect those changes alone will be worth 40-60hp… What’s your suggestions?

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I would do a compression test to try and figure the compression before I ordered a cam, but I can tell you if the heads are not ported, it'll be slow. Also headers are too small for W2 engine, and the dual plane...big time power loss! I would install low gear set in the trans before changing gears in the rear end.