Not Ranked
You just need to tune your carb. It probubly has #80 jets at all four corners, god knows what # power valve, etc. I bet you are just running too rich, and a carefull tune of all the circuits on your holley would fix it. 850 DP is a little on the big side if your motor doesn't make an honest 500 hp, a 750 would give you better low end throttle response. If you decide holley's are junk, send me the one you are running now, I'll give it a good home.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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