First off, be careful, you don't want to be running it with it super hot all the time, if you know its overheating, take special care not to run it hot.
The stock impeller is a plastic piece of dog crap. Get a new Pro Design impeller thats a lot stronger and flows better. Second, get rid of all the "collant" and get some "Engine Ice" coolant. The local dealer should have some or be able to get it. It will run cooler than the coolant. You have a Noss head, but with what domes. A lot of people buy the heads expecting to run cooler but throw super high compression domes and that offsets the temp. drop. You may get some inline coolers, I don't know if they help, but some like them. Check your radiator for proper flow, make sure its not stopped up. There are other things you can do, and you may check in to getting a gauge so you can tell what the temps are exactly.
If all else fails, and everything is good, you may have to get a high capacity radiator. It shouldn't just run super hot, so chances are, with some investigating, you'll find it.