8MM retainers/locks on 5/16 valves: OK or not OK?

these 5/16 locks (Crane 99121) are giveing me MORE I.H. than the Lunati 77132 (8MM) locks (both useing same Lunati retainers (75740). OK, I went ahead & assembled it with the crane 99121 (5/16) locks/lunati 75740 retainers that lunati say are OK for 8MM or 5/16 valves, with no inner spring. With me haveing ground off the lash cap perimeter & all assembled, the valve tip is just slightly above the raised perimeter of the retainer & there is a concave dip in the retainer from the perimeter inward so I dont think the roller will hit anything unless the rocker goes sideways quite a bit (the OE mag guide plate pushrod slot is wide but I think it will be OK (??). Hopefully soon I am going to fire it up/breakin & this is where I am at now but I will change anything I have posted if you guys think I should do so. (I felt the love on this one, & it is for sure very much appreciated, thank you!) RR