Hi Bob
I have bought a number of Mil Spec pumps off of eBay really cheap.
The Mil Spec pumps have ceramic parts inside,which make them tougher than civilian pumps. The Mil Spec ones will run on jet fuel without damage.
As to injectors i did the same and bought new Bosch from eBay as well,but i bought before i needed them.
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews