Little carb issue

[DPete]

I have a 350 with Edlebrock carb (manual choke) and intake. Starts cold and runs fine but when I shut it off hot and try to start it up after several minutes the engine is hard to start and seems flooded. I took it to the local dyno tune shop and they made some changes but the condition still exists. Anybody have a clue? The dyno shop checked spark and say it is good. It will start right up if shut off hot and immediately restarted, the problem is when it sits, say long enough to have lunch. I asked about the float level, they said it's good.