No way the OS .32 is going to spin an 8x8 up THAT high...
My West .50 doesn't even get there on that prop, and that's quite a bit more engine than an OS 32...
You would be looking at 16,000 - 17,000 probably. On the stock muffler you'd probably have to run it WITHOUT a prop to get it to turn 22K
... seriously...
As for the GMS, stick to a 9x6 or 9x7... these engines are not meant to turn mega rpm on small props.