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Originally Posted by 66Submarine
I'll actually agree that when I put the HEI in mine the other day it didn't really seem to do much of anything (kind of what I figured). I gapped the plugs all the way out to 0.060.
A big carb will just (potentially) increase top-end power and if anything I'd probably expect worse mileage.
I stuck a vacuum gauge in my truck (stock '71 250) a while ago and IIRC I had to wind it up to 3,500RPM+ before I really saw any vacuum at WOT. How often do you have it wound up past 3,500RPM with the throttle on the floor?
Small-tube headers will probably add a little power (not sure how much). Might be able to effectively use a slightly larger carb with them. Large-tube headers are not what you want.
Jetting/tuning the carb will probably help, as would reworking the distributor advance curve.
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I agree with you, but...put a bigger carb on there and you'll notice a difference over points. That'll little briggs and straton single barrel( LOL!) is like starving a hungry teenager of food. lol