Actually, when it comes to the Fluidyne issue, I had the exact same problem. I had upgraded fans on the stock radiator, and a coolant mixture with water wetter, but I was still overheating.

I dropped in a fluidyne and BAM!, no more overheating. Not sure what else to say. I also know six other people personally that did the exact same thing. The changed nothing but the radiator (fluidyne replacing stock) and their overheating problems went away.

In this case, get a BRAND NEW headgasket (NEVER EVER reuse the old OEM one, EVER). Get yourself new OEM HG and some ARP headstuds as mentioned above and you should be ok to retest your current cooling sytem. If it still overheats, buy a Fluidyne.

Start saving now. :) It's not getting any cooler down there in the desert.