Re: 11-1 383 atk/profiler 210 carb tuning questions.
There's a lot of factors and I honestly don't understand them all. I've never spent any time with a 5 gas and you don't need to. You just have to use all the tools you do have. Your plugs and MPH won't lie to you. A WB can get a diluted mixture due to cam overlap, leaking headers, etc. Also a misfire will show lean on the WB because the oxygen wasn't burned. A WB doesn't read how much fuel is in the exhaust, after all. I use the WB all the time and it's taught me so much but experience tells me that you also need to use all your tools to get a complete picture of what's going on.
Some other essential tools are-
Sight- look at the plugs. They won't lie but they don't always tell the whole story.
Hearing- WB says it's good but does it sound happy? Lots of old timers could get really darn close based on sound alone.
Feel- does it shake, hesitate, blubber, surge? What does the WB say when it feels good/bad? Most of us are only sampling one bank and the WB gets an "average" of the one bank.
Vacuum gauge and tach- you have to know at what RPM and what vacuum conditions it's acting up.
None of the tools above are 100% effective on their own but when you combine them all you can make great things happen.
But first, and I can't stress this enough,- GET YOUR IGNITION RIGHT! And then leave it alone!
Make one change at a time and write the results down!
Trust mother Holley for your baseline. Put the carb to stock to start; Holleys are typically pretty close if you picked the right one. If anything they'll be off on the safe side.
Get the idle and transition circuits sorted first. They provide fuel at all times except in some circumstances they can act as an emulsion bleed at WOT but that's a non-issue here. Changing the idle and transition has a big effect on the rest of the fuel curve. Get it right first.
A lot of times I'll disable the secondaries until I get the primaries right. I've also blocked PVs to take that variable out of the equation.
Be patient. You'll learn more every day if you stick with it. I expected to be a carb master as soon as I got a WB and I was very disappointed. It takes time. I'll let you know when I get there so stay tuned. I hope you have another 50 years to wait....
69 Malibu Stock 307, Reverse Manual TH350, 4,500 Stall Edge Converter, 4.56 Spool 35 Spline 12 Bolt
76 C20 VortecPro 496 628HP 655 lb/ft TH400 Edge Converter, 4.10 14 bolt