I would go with the black ones like Biggus said. I few boats ago, I had a set of Blue ones in my Sonic. Within one season, I replaced them both. And had an issue with a new blue one also. Just my two cents. That was 5 years ago. Good luck

Kurt

my 91 42 revo had 3 mallory pumps ,1 mounted on each eng[carbed],running in parallel with the mech block pumps,,mallory rebuilt these for 1/2 of buying new ones,and these used regs too