oil system, what to buy??

When I built my 360 I asked the place that machinmed my motor this same question about pumps. I am kinda fuzzy on the details but I remeber them telling me there are like 3 manufacturers of Pumps for small block Mopars, Melling and I don't remember the other 2 brands. Supposedly one of those 3 makes all the pumps for all 3 so it doesn't matter which brand you buy. As far HV goes for my build up they really didn't think I would gain much by it.


For oild pump drive get the Mopar one. I had a Melling and it was to big and wouldn't fit in the bushing. Unfortuneately I didn't find this out till the motor was almost done. Instead of tearing the engine all apart to have the bushing clearanced and cleaned again, I took a chance and took the Melling one back to Napa and ordered one from MP. The Mopar one fit like a glove and I didn't have to tear my engine back apart.