340 fuel/ignition issue?

As I first said, I've been working with two carbs. My original 6518 was working well until a brass float sank, and the fact that the throttle shaft was getting fairly worn. So I decided to build a 6322 that I had. I re-bushed the throttle shaft on that one, did a rebuild kit, new nitrophyl floats, new dashpot, drilled jets to match my original, all the same settings. Installed it worked great for a test run, then started giving me the screwy symptoms, mostly in the end I couldn't get it to idle lean enough, or return to idle as it should.

In the meantime, I replaced the bad brass floats with nitrophyl in the 6518, and re-bushed the throttle shaft it it also. Once that was done I reinstalled it (old faithful now in like new condition!) Thermoquads are such great carbs! Love the throttle response, the steady metering, good mileage, and the WOT power. Like fuel injection with no electronics!! :thumbsup: