I rebuilt my carb and it runs very rich

[Aprules2]

Hi everyone I am new to the forum and could use advice from some seasoned carb builders. I have a 75 Cadillac Coupe Deville, the car has a true 67k miles on it. It sat in a garage from 1979 until October 2013 when I put it on the road. When I got it the previous owner had gotten the carb rebuilt and some how got a chevy 350 carb back instead. I replaced the fuel lines got the fuel tank boiled out, replaced the fuel pump, and tuned it up. It never ran right because of the incorrect carb.

I bought a good used carb from a Cadillac only junkyard. Its a true 75 Coupe Deville Carb. I sent the base plate to a local rebuilder where it was cleaned, checked, and rebushed. I soaked it in chemdip for a few days and then blew it out with compressed air followed by spraying every orifice out with carb cleaner just to be sure everything is clear. Then I rebuilt the main body of the carb. I did a full tune up, replaced all the vacuum lines, turned the mixture screws in until they seated lightly then back them out 2 turns and started the car. It ran rough and idled low. I checked my timing its set to factory specs. I set the idle to 700 and turned the drivers side screw out an 1/8 of a turn and saw the vacuum go up, then I did the passenger side and kept going an 1/8 at a time revving the engine occasionally to clear it out. As the vacuum rose the idle picked up so I set it back down to 700. Finally I got 24 inches of vacuum at 700 rpm but the mixture screws are 4 turns out. I know that's too much for a q jet, not to mention it stinks incredibly rich. Ive checked with a can of carb cleaner and cant find any vacuum leaks, Im not sure what else to do. Can you guys help me out?

[Aprules2]

I worked on the car a little more today trying to diagnose it. I checked everything a second time, and then started messing with things. I plugged the hose going from the carb to the PCV valve and I noticed i was able to set the carb much easier. I had it set with each screw between 2 1/4 and 2 1/2 turns and it idled pretty smooth with 22 inches of vac. Then I put everything back together and it idled like crap the vacuum was bouncing up and down, between 21 and 22. So I tried tuning it again and it just wants me to set it very rich. it starts to idle better when I hit 2 3/4 turns and idles best at 4. I know you need to run PCV I just dont know what to do about it..... I think Ill pick a new one up tomorrow to see what happens.

[qjetsrule]

JUST WONDERING, WHEN YOU LOOK DOWN THE PRIMARY VENTURI'S AT IDLE IS THERE FUEL DRIPPING OUT OF THE MAIN NOZZLES. YOU MIGHT NEED A FLASHLIGHT TO SEE PROPERLY. THIS MIGHT INDICATE HIGH FLOAT OR TOO MUCH FUEL PRESSURE. THE FACT THAT YOU HAVE MIXTURE SCREW ADJUSTMENT IS GREAT, AND MEANS THAT CIRCUIT IS WORKING PROPERLY, I WOULDN'T SWEAT THE 4 TURNS AT ALL. GREAT VACUUM NUMBERS. THE LESS YOU HAVE TO TURN IN THE IDLE SPEED/THROTTLE SCREW THE BETTER,  IT SHOULD JUST BE TOUCHING THE THROTTLE LINKAGE. SOUNDS LIKE YOU DID A GOOD JOB. GOOD LUCK