Disappointed magnum head flow numbers....

Brooks James said

I realize that I need good
exh flow that is why I put a nitrous grind in it.
I anticipate around 500 horse on the combo with 150 shot of nitrous I was hoping I could accomplish it on stock heads
I don’t have the money for aftermarket heads that would definitely do the job
I jus want an estimate nothing is chiseled in stone
360 mag
Stock block/ heads/ crank/rods/ 9:1 pistons
Edelbrock knock off airgap
MSD 6al my dizzy accel super coi904 w: 3500 converter
Massaged 750 dp
You already the specs on the cam engine is not that far off 380 crate

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I can give you some track numbers if it helps on my '71 Cuda with stock 340 motor, 2.02 non ported heads that are around 215cfm@best+HS dom intake, 850DP, .590"DC sft cam, 4200stall etc. etc. Motor only made 367fwhp, best mph was 108 NA, according to weight/mph. Added a 250shot but only got actual 158hp from it (525) for other reasons like too rich petrol jet specs back then (110n/110p) and not enough backed off timing but ran 122mph. So you can do it on stock heads, you should be able to get almost 150hp from a 150 shot if you tune it well with todays jettings etc., and your motor is up there with NA hp.