I probably wouldn't try the PSS on a 10" rim. They run way wider than anything else.
Dai and I were looking up reference material yesterday and he found this:
michelin pss lots of pics 305 30 19 and 265 35 18 weight and fit - Corvette Forum
It pretty much confirmed our suspicions that the PSS is super wide and is probably going to perform like poop when a 305 is mounted on a 10" rim. 10.5" would be in spec, but even on a 10.5 it's going to be super meat. 10"... no way.
The Re11s run narrower and will work, though.