Thats definetly fat way to rich. I would do what Cab said first and jet down the primary's some first. And go at least 3 sizes as you want to see how much a difference does. Once you get it lean enough you can tune from there. Check the power valve while you are there because if the diaphram is blown it will pull that fuel right thru the vacum source that goes to the power valve. Clean the plugs or replace them and then jet down and drive it. Thats keeps it simple for now and lets see the results from that. You cruise on the primary's most of the time so I would not worry about the secondaries just yet. Ron

Myself, I'd check to make sure that there isn't something else wrong with the carb first.
Wrong metering block gasket or wrong P/V grasket with both dump fuel. Bad power valve won't dump that much fuel.
That carb came with P/V protection as has all Holleys made in the last what, 15-20 years,?
Your under 1000' so your jets are probably close.

Do you build the roof of the house first?

I'm out, you all have fun.

I'm still learning how to properly tune a vehicle, but from everything I've learned you should set the timing at a baseline like what has been suggested, so that you can then properly tune your carb using the carb suggestions mentioned earlier. proper timing allows proper carb tuning.

roe

Agreed, timing is first. Second I'd check the power valve. I switched valves and didn't tighten it enough and was dumping fuel past it, reset it and all was fine.