Hi Peter
Fuel pressure seems a little low, stock, pump runs 5 to 8 lbs, but what you have is plenty to start and idle the engine. it starts cold so dont think you have drain back. I'm thinking heat problem. If you have a heat riser on the exhaust manifold that is stuck closed or are using the stock air cleaner and the thermac valve is stuck closed, either will cause the carb to get hot enought to boil off the gas in the carb when you shut it off.