Uh-oh...flooding

Hey all:

My '71 has started suffering from a heat-soak flooding thing since the weather got warmer. The warmer it's been the worse it's gotten.

What happens is, if it sits and heat soaks an hour or so, it'll restart fine, but then loads up and tries to quit if i don't catch it and keep it running.

Today it had a really bad spell of it after I had been out doing video work in the 90 degree heat. It started quickly but then loaded up so bad it would not idle.

I let it quit and yanked the top off the air cleaner. The choke was wide open, but it had puked gas out of the center bowl vent and down onto the intake manifold.

I drove my truck on my errand and when I came back a couple hours later, the car spun a long time but started up and ran like usual.

I even caught this event on camera a month ago, before I got new exhaust on:
[ame="http://www.youtube.com/watch?v=pDfQWPDnFJo"]YouTube - ‪Chrysler starter workout‬‏[/ame]

Notes:

Hot starts are always quick, it doesn't normally spin for a long time before catching.

There's no other flooding symptoms. Runs good, idles good, even at 200 degrees.

There is the thick isolator under the carb. This is a Holley 2280 on a plain 318 and it's been upgraded from the quirky '71 style vapor system to the later type with 1 vent tank.

I forgot to re-install the rubber stopper that blocks the flow into the bowl vent to canister line..it's open all the time and there was some liquid gas in the line.

I am using the original non-vented gas cap and filler tube. I think Slantsixdan said that was a no-no with the 1-port tank..how come?

Does it sound like the vapor recovery system could be causing this?

Thanks!