well actually maybe none. if your running 350 hp with 9.5 com your heads arent flowing that bad. if they have been ported and polished it may be your cam.
because with the n2o heads wouldnt cause the 80 hp gain from a 125 shot now this 125 is it from the kit or from using the jet's size on a 351 engine instead of a 302 (if the kit is designed for one engine power levels arent compareable for other engine sizes.)a 125 shot on a 302 = 107 on a 351 Flow and fill
69-70 heads have a fuge flow potential and if ported and set up right will flow with any entery level aluminum head.
I'm looking at replacing mine with AFR 205's mainly for weight and to improve flow.
have you used a vacum gauge to determine where your bottle neck is .PKRWUD posted a real good discription on how to test vacum on the intake maf throttle body ant then heads do a search and try it to see if the heads are in fact your bottle neck.
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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