Keep It Simple Sam, the lifters that ain't being replaced put em back in the same hole ( & same innards in same lifter body and mockup the new ones & check by cleaning the lifter/lifter bore with brake kleen then lubing lightly with WD40 then drop the lifter in & raise it up off of the cam lobe with your finger & let loose of it & it should fall back onto the lobe with a resounding "thump" & if not then it is too tight & will not rotate properly & will fubar the breakin which you will be doing (go thru a normal 25 minute cam breakin procedure). I forgot if this is hyd or solid but check the preload/set breakin lash dimention. If solid I set the lash then remove the rocker assys then goop the cam then reinstall the rocker assys as a carefull R&R will not change the adj screw/locknut position & cam/lifter failures are epidemic. Holler how it turns out.