my buddy's about to buy a 850HP blown BBC for his TX-19. it has a Dominater pump with a A impeller and droop.he was told it will need a preloader also. I always thought a P/L was just to keep the pump fed for a better hole shot, and also will lose 3-4mph top speed. is this true, what should he do? btw, this is a lake boat with a medium layup that will probably never see a christmas tree LOL!