I find it doubtful the fuel evaporation in less than 10 hours, overnight in cool-ish weather. It surely cannot be plugs (I have read a LOT about them), unless it wasn't rebuilt correctly by Quadjet Power - they aren't supposed to be any other places better (unless you got one done by Lars).
I went to great length to get the
correct 72 Qjet for my truck (the one I took off was from a 78 Chevy Truck 17058213). But here is my number:
7042208. Which now has been worked on by Quadrajet Power (modified to Performance II). You wouldn't believe what I spend on the carb and then to have it worked on. Not to mention 18 weeks of waiting (and the two before it getting the 7042208).
I thought I was on to something when I found the truck will idle now at ~600 RPM's with
throttle fully closed.. it will not die anymore with throttle closed.
From Mark @QP
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Carb can idle with them closed. It has bypass air built in and we richened the mixture based on your engine descriptions.
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