She won't idle, or stay started?

you said it kind of froze up ,it could have caused a head gasket to blow and that will cause the problem your having,when you added the electric pump to it did you add a regulator to help out on the fuel pressure because electric pumps run a little more higher pressure than mechanical pumps do so you may be flooding it out some,id check the pump pressure on it you don't want no more than 5 pounds on it at the most,anything more and it will flood out,and also cause it to back fire through the carb,check to make sure its in time also,good luck.EDIT, yes to much fuel will cause it to flood out which will cause it to loose speed going up a hill and shake like that,it has to get the right amount to it without going over the amount it needs to run right,and most after market pumps run around 6.5 pounds on them ,good luck.