I don't know if you tried what tooljunkie said about breaking the fuel line loose at the carb and cranking it to see if it is pumping gas but I had a similar problem with my 1980 Volare with a 225. I replaced all the stuff like you have and still it kept stalling. I decided to pull the top off the carburetor the next time it did it and what I found was an empty bowl but the reason was that the float was sticking at the top. It was rubbing the side of the carb bowl just enough to stick. I bent the arms to the floats ever so slightly to get free movement and it cured it. I was shouting hallelujahs.