Motor is hard to start after warm up

I agree, you need to connect the choke cable and play with it first. But also though you may be getting vapor lock. My trucks 360 would start on a dime cold but as soon as she warmed up a little and shut off, it'd have to be cranked for awhile then finally start up. Someone recommended a insulator spacer between the carb and that worked miracles. But connect the choke first.