Oil pump? It sounds like you mean fuel pump. Do you want mechanical or electric? If mechanical, they're all pretty good. If electric, I'd stear clear of the Holley pumps (reds and blues), I know a lot of people that have been left stranded by them, plus they seem to be noisier than other pumps. Use a Mallory or Summit catalog brand, the Summit pumps are re-boxed Aeromotives units for $50 less.