http://www.autoperformanceengineerin.../bel_pump.html
Warbro now offers them, or at least part to rebuild them. They sold a lot of them so there shoudl be cores easily enough to find.
This is the Nova On Sunday race car at SCR12. Dupree offered them in simplex, duplex and triplex configurations. They also went by another name, but it escapes me right now.