Melling pumps:

I built a 351W in 1988. Sold it, and the Cougar it was in to a buddy in 1991. He still has it. The top end has seen many different configurations since then and currently is sporting a big centrifugal supercharger. It is still running the same Melling pump I put in it back then and even with over 100k on the bottom end everything is still solid.