HAHahah man oh man I've been hunting this issue myself with my 1406 w electric choke, ZZ4 SBC, GMPP aluminum intake. Here's what I came up with.
Every time I'd start the truck, it'd fire up like clockwork. I can kill it and hit the key and it cranks up again and doesn't miss a stride. Even when the truck is hot, when I come out it'll usually just start off where it left off if I restart it within 10 minutes. After 10 minutes it cranks over an extra time or two, but it always gets going no problemo without any serious flooding symptoms. Summer or winter, I get these patterns.
Now, the one anomaly I seem to have is in the mornings. I sleep at my girlfriend's, drive less than a mile to my house to get ready for work in the morning, get in the truck, hopelessly flooded. This seems to happen nearly every time, and it's infuriating, bc it makes me late to work. The only time my truck is unreliable, that one trip in the morning!
First thing I do is assume it's a fuel pressure problem. I'm using a holley red top fuel pump so I'm assuming the 6-7psi flow rate is a little high for edelbrocks, which like 5-6psi range. So I add a regulator, and dial the pressure down to 4.5psi. Then I rebuild the carb and reset the float levels. The 1406 is still factory calibrated, I have not rejetted.
Even after this work, the problem persisted. So I can now round out a fuel pressure problem.
Then, I was instructed that todays bad gas is heavily oxygenated and supplemented with Ethanol, especially with the winter blends we get here in TX. Because of this, it is common to see the fuel resting in the float bowls to percolate and boil over into the rest of the metering system, and thus into the intake, causing a flooded condition. The solution, per Edelbrock, was to install an Edlebrock 9266 heat insulator gasket.
I added the insulator gasket, and lo and behold, no change.
Finally, I call Edelbrock back and the dudes tell me to lean up the choke a bit. So I lean the choke up, no change.
So I end up coming up to intake manifold swap time, chunking the GMPP intake with the EGR provisions for a Performer RPM. While not as bad, I am still having rich start conditions when driving the motor before operating temp and attempting to restart 10-15 minutes later.
After all of this I go back to the choke to figure out if it's even working. And guess what. It wasn't, the hot wire to the choke isn't pulling anything on my multimeter.
Save yourself a lot of trouble and get the choke working correctly before you throw money at the problem. What's happening is that the engine is warm enough to run on a richer mixture, but the choke is closed all the way, and it's flooding the hell out of the truck when you attempt to start it again.
