For a fairly stock motor all you need is a stock delivery pressure/volume pump if everything is set up correctly. There is no need to guess by replacing parts unless you cannot duplicate the problem during testing. With some digging for volume specs and testing the pressure you can tell what shape it's in. That said one of the main differences you will find in stock replacement type pumps is whether or not it has a vapor return line or not. Just look on your pump for a third nipple that has a hose going back to the tank. The vapor return is also very effective in helping with the dreaded vapor lock/fuel starvation during hot weather which unfortunately is much more common with todays alcohol gasoline. Ames performance engineering Has some nice replacement pumps and also detail exactly what you need based on your setup. I trust them mostly because I have been using there parts for many years and they are Pontiac only dedicated.