Need correct crank pulley!!!! Any ideas?

Wyrmrider said
your water pump-- solid impeller or with a plate behind the stamped fins
prevents cavitation and water circulating around the stamped fins

I don't remember. It is the O.EM. style water pump, so whatever those are.
Anyways, I'm fairly curtain that my heating issue is the cause of incorrect pulleys. I am on the hunt for a water pump pulley that is 5 3/4 Diam. And a crank pulley that is 7 1/4 Diam. I think that will solve my issue.