Thread: A little help please

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Looking for input. Finished the 402 top to bottom from my 1971 SS 396 Camaro:
.030 over
10/10 grind on the crank
reconditioned rods with ARP bolts
Machine work and hyper pistons to 9.5:1 CR
Comp Cam Xtreme Energy (sorry Pat) 218/224 with .504/.510 lift 110LSA
New springs for cam
Qjet
Pertronix
Stock intake
Car is M22 4-speed with 3:42 Posi rear end

Engine is back in the car and I'm getting ready to do the fine tuning on the dyno but am thinking about adding headers. Before I spend the money for the dyno, what header should I use? And what can I expect to gain?

Thanks much for your thoughts and experience!