In my humble opinion, other than all out race, or specialty rings, there are two kinds: rebuilder or standard rings, and file to fit. I have seen rebuilder rings at .035 and things seem to run fine. The guys that run power adders on stock shortblocks open them up to specifically open up the ring gap, then reassemble.
I think I would run the 25-27/24. More, if nitrous is a possibility.
