#1 priority is that the rod bearings recieve enough oil/have proper clearances. I'm a firm believer in oil passage mods. To answer your Q not sure if pump casting quality/tolerances have gotten better or worse or stayed the same but it's pretty much a troublefree piece (make sure the relief valve ain't stuck/moves freely). For other than a DD I'd suggest a std vol for a start with a hi psi spring (if needed) as a hi vol stresses the inter gear more and if the high psi spring will get the psi high enough with a std vol then I'd think a hi vol would be a waste (plus stress the intergear/cam). If your passages are opened up to where a std vol even with a hi psi spring will not supply enough flow then yes a hi vol pump & why I tout passage mods is the gauge in the vertical passage from the pump may show enough psi but the critical bearings (rods) may not be recieving enough to keep them out of trouble