Why does everyone hate on the Q jet? They are just not that complicated.
I thought they would have little demons inside of them when I got mine, and that is just not the case.
I say fix the striped inlet like Geezer#99 said and then tune it up.
You need a timing light, tach, and vacuum gauge.
hook everything up, set timing, hook up vac advances, and adjust idle mix for best vac going back and forth to adjust the idle. Pretty simple and the same thing you need to do for any carb.
when you get out on the road, If it stumbles when the secondaries kick in, check the secondary butterfly spring tension. Adjustment is on the choke side, small allen head screw and a small flat blade. Loosen the allen head screw and turn the spring tension till there is no tension, then tighten the spring one full turn and lock it down. Go for a drive and see how it does. If no stumble, loosen the spring 1/4 turn. If stumble comes back give it 1/8 turn tighter... 3 or 4 drives and you should have it dialed in... There really is not much else to it.
Qjets like to bog when the secondaries open because the butterflies swing open and then bounce closed for a second causing a rich bog. Once the butterflies stop swinging like a saloon door the engine will take off. Just need the right amount of spring rate to cushion the swing when they pull open. Done.
vac gauge
http://www.harborfreight.com/automot...ter-93547.html
tach
http://www.ebay.com/itm/Actron-CP760...b2aac6&vxp=mtr