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think in my original post I said they were both 6.5". But on second glance today, as best as I can measure, my crank pulley is 6 3/4" and my water pump pulley is either 6 1/2" or 6 9/16ths,
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according to my calculations (and that ain't gospel,I can assure you), your present set-up is 4% overdriven........If you switched to the 5.5 water pump pulley, you would then be 19% overdriven, quite a difference..............you would need a 5" water pump pulley to get to 25% overdriven with the 6.75 crank pulley........
If you can get the 5.5" water pump pulley, I think you'll see a difference, how much is anybodies guess, but, I'm guessing enough to make things a lot better....probably not gonna be much difference from the 6 3/4 crank pulley you have now, going to the 7" you have as a spare....only about 2%........
On the revving issue, I have done it and have seen the temp come down a tad, but not much, with the higher revs comes higher engine temp,ie,generating more heat in the combustion chambers than at idle......
David