The .472" boost valve is more of a personal preference. The kit in my link is just for the 3-4 clutches & steels. you still need the forward, overrun, reverse input & low/reverse clutches out of the rebuild kit, NO need for special frictions on the rest of the trans.
I upgrade the the 3-4 clutches on every trans I build, Behind stock stuff I use this
http://www.oregonperformancetransmis...y_Code=700R4RB