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Todays gas evaporates faster then the older gas blends and if car sits for awhile bowls could be empty or low. I would check fuel pressure also since you say pump is old. spark plus fuel it should fireup.

I used two 1406 carbs on my 392 hemi and am pleased with all around performance. Of course cam, compression and rear axle ratio's have a lot to do with performance of carbs but the 1406's worked fine in mine.

Sounds like your kickdown (no down shift below 30 or 50mph) is not adjusted right to start with make sure you get that done. The other thing is how old is that carb and how long has it been sitting? No kickdown and to much fuel can cause the bog. Make sure your accelerator pump is functioning...

If the pump is external to the tank it should be mounted as close to the tank and lower than the tank for better operation as pumps are meant to push fuel.

I run 2 4's on my 392 hemi with progressive linkage. Not only is the idle great but the off idle performance is smooth. The gen 1 hemis came with 2x4's from the factory. And when you step on it and bring in the other carb it to me out performs a single carb. Yeah, todays carbs and intakes can...