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I've got a edelbrock performer intake manifold edelbrock performer 4b carb serpinten swamp from a v-belt and i have a lot more upgrades than that I'mjust trying to figure out how much horsepower im putting down
 

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Don't guess or make something up, find a performance shop with a dyno near you and know for sure.
70's motors are notoriously weak because of primitive attempts to reduce emissions.
a 69 302 with your setup might make 250-275 hp. a 70's or early 80's 302 with the same mods might make 30-40 hp less because of low compression motors.

my dad's 78 Mercury Marquis had a 460 4 bbl and it only made 270 hp but made 375 ft/lbs of torque
 
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