So I picked up a 1981 chevy C20 custom deluxe. Lots of new stuff under the hood, new hedman headers, new edelbrock intake, new edelbrock 650 cfm carb, new edelbrock air cleaner, new radiator, new red showboaty distributor, and yellow show boaty plug wires, 2 new flow masters, the list goes on and on. I'm having an issue with it though, when I bought it I was able to barely tune the carb well enough to drive it home. The guy I bought it from had money to throw at it but didn't actually know a whole lot about cars so he gave up. Long story short, I'm trying to find a good starting point to tune it at. I had it running fairly well but then I screwed with it some more and lost the progress I had. I dont know a thing about carbs so what I need to know is what position on the fuel mixture screws is fairly standard. If you're going to tell me that it's all different and I need to get a vaccum gauge and turn the left one all the way out and right one all the way in please dont comment. The block is a standard 350 with a 650 cfm edelbrock on it. I cant imagine why my 350 would only need 1/2 out and yours would need 3 full turns. The spark plugs on every 350 8 know of are set to .035, the fuel pressure is fairly consistent on carbed 350s, your engine timing shouldn't be any different then mine. So it's a little hard for me to believe that your 650 cfm is significantly different then mine. I need it running so I can get it down to the shop 2 miles away and get it fine tuned.
1 full turn on both? 1/2? 1-1/4? 2?

Pretend your on a game show. All you gotta do is give a guesstimate on what you think would be fairly standard. If the hostess gets in the truck and she can drive it 10 miles on your best guess without completely fouling or roasting the plugs, you win 2.7 million dollars.

 

First, the fuel pressure, is it a mechanical pump or electric, very important. Plugs, for a 350, AC R44, gapped .035" Edlebrock spread bore 650 cfm, screw the idle air mixture point screws in until the seat, then back out until the are all the way out, then screw them back in half way. That will get you were you need to be.

 

Vacuum gauges will be for setting the timing, you should be around 6-8 deg btc at 750 rpm

 

Here’s a link https://www.edelbrock.com/pub/media/...ers-manual.pdf