One good source is Precision
Oil Pumps in Madera, CA, talk to Doug. Phone (559) 645-1951. Purchased his blueprinted FE Pump and Roller Rockers, Billet Stands, Billet Shafts, and Billet Drive. The engine (427 SO) just got off the test stand, great results, 50 PSI at idle.
I personally would not put a
oil pump in a high dollar FE without it being blueprinted and bench tested. I think the 1/4" Drive Pump is around 70.00, the 5/16" Drive Pump is 85.00. Stock Pumps are full of metal particals and need to be disassembled and cleaned before using. Less you pump all that crud in your
oil galleries.
He has a web site , try
WWW.PrecisionOilPumps.com, I think.