That will be ample, no matter what you end up doing with respect to power level. Are you going to use the OEM ring set, or go with CP's rings?...I decided to do the .003" p/w clearance since some of the coating will wear off so that should end up somewhere within the range.
Also, have you read the NASIOC discussions on ring gaps? Interesting stuff - what surprises me is how tight Cosworth sets their gaps. No one else (that I know of) has had the courage to try theirs at Cosy's numbers, but ya gotta figure Cosy has a fairly good idea of what they're doing. :lol: