Holley 1920 problem

I bought a 72 slant six swinger dart with a holley 1920 that had been sitting for a couple years. It would start when cold and then die when it warmed up and the choke opened. I replaced all the vacuum hoses and checked for leaks. The fuel pump pumps good, I put on a new see thru filter (no junk so far), and disassembled the carb. There was a little gunk and varnish in the bowl which I cleaned out. I sprayed all the passages out with carb cleaner and none seemed to be blocked. I bought a carb rebuild kit and reassembled the carb. Now it does exactly the same thing, will start when cold but as soon as the choke opens it dies. If I back the idle mixture screw out til it almost falls out it will run rough with the choke slightly cracked closed (but still dies when the choke is opened that last little bit).

What do I check now?
Thanks