The wrap around the exhaust finally fixed my stalling problems when the outside temps exceeded 90F. The engine ran fine but if you dropped to idle it would starve. My guess all along was fuel being too hot (390s put out a lot of heat). I started with a carb spacer, move the fuel line, add the piece of heat tape near the heater hose. Last fix was the wrap on the exhaust. That did the trick. It idles now even when its very hot outside and its been running highway speeds. Starting again still is a chore but its manageable.
