Thanks Boogie, I'll have to decipher most of what you said. Sorry, I come from the world of sport bikes and tuners where I can hook up a laptop to my ECU and adjust from there. I'm fairly new to carbs and all this old school stuff so everything I have to learn.
I checked the list number on the carb, 4776-2 which pulls up this.
Holley Double Pumper® carburetors are a perfect performance upgrade for hot street cars and race vehicles. Double Pumper carburetors are an American icon when it comes to performance carburetors. From their roots as the premier carburetor on many factory muscle cars to powering thousands of...
I bought a vacuum gauge and followed the video on holley's website on how to set vacuum on the carb. Everything seems to be good for that part. I won't worry about vacuum advance for now but I did hook it up and did a test drive. Cruised great. I will disconnect for now.
Here are pics of what I have going on. The carb was rebuilt by a fuel specialist shop in Gilbert, Az. They rebuilt the carb on my 71 Firebird and it runs great so I trust the work they do.
As for it sitting, yes, 16 years. Maybe fired up 3-4 times in those 16 years. The engine just sounds 'grumbly' for the most part. Cruising sounds pretty good but still seems to 'grumble' a bit.
Again, thank you everyone who is helping me figure this out. I know I'm asking newb questions and should have a better understanding of all this. Unfortunately the man who would of taught me isn't with us anymore an I don't know many people that work on old cars like this. Most of my friends are IT specialists and coders, and not very handy when it comes to cars.