Carb Issues Poor idle after warm up?

[trndkll67]

I just dropped a new 302 HO in with 351 firing order into my 67 coupe. Then I found a brand new Edelbrock 600cfm (#1400) carb to replace the old tired one (600cfm #1406). (Note: The #1400 is specifically listed for a chevy but the only difference I can tell is that the #1400 has an unplugged (open) carburetor bowl vent tube and the #1406 comes with the ford linkage adapter. I popped the #1400 on, everything lined up perfectly(didn't even need the linkage adapter) and I plugged the carb bowl vent with rubber vaccum fitting. It started great and runs great for about 1 mile. Then, when I pull to a stop, the idle is so inconsistent, it barely stays running. Yes, it has even stalled a few times at the stop light/sign. If I park her overnight, and fire it up the next day, the same thing....runs great at first, then get choppy.

I have swapped out the metering rods with almost 8 sets(smaller and larger diameters), some run ok, other cause knocking and pinging. My best luck was with the 073x042 rods(Edel #1455), but the idle issues are still there. I've used some carb spray and can't find any leaks to speak of.

This is all I know to check. Could this be an electric choke issue? Could it be getting flooded at high speeds so at idle it is choked with extra fuel? Could it be a vacuum issue? Any help and advice on what to check/how to check would be much appreciated! Thanks!