i would look at putting in a no blow back check valve in the base plate like said . put a new power valve in it or two if it as one in the rear then you need two kits for this carb i would run the msd if you are looking for a new dist if you want to keep the mag any dist will work to see if it is the mag is going south make sure if it is a roller cam engine that any dist you use must have a bronze gear on it and if the power valve is bad it will empty the bowls of the carb to check this take out the sight plug and it will be empty