I have occasionally gotten advice on building a performance b20 from a gentleman who races a b20 powered car. I have reason to require the absolute best possible oiling (it's a long story just why...). He recommended using a certain style- {I think 76-79.5} of *b21* oil pump body with the lower casting of the b20 pump. Has anyone done this? If so, why?- are the pump "gears" taller or of larger diameter? I live in an isolated area, so don't need the hassle and expense of special ordering several non returnable pumps to try to piece something together... Any inlet/outlet point that a guy can/should reshape to improve flow through the pump? Any advice apprieciated...