Overheating Issues - SB Duster

Hey Everyone,

Well I have been having problems with my car running HOT since I put it together. Its a 360 in a '71 Duster with a 3-core 340 radiator and a stock 7-blade fan. I recently installed a new 180* t-stat hoping it would fix the problem, when I went to remove the old one I noticed the top of it was covered in slimy rust. The car has 50/50 coolant & water, so I just assumed the t-stat was bad. I put the new one in and I am having the same problems. I don't currently have a shroud, but with the temperatures we are having right now, its a non-issue. Btw, the t-stat is installed with the pointy thing at the top, aka: correct.

I have no problem getting this radiator rodded out, but I want to make sure that my money will be spent wisely. Please let me know your .02.

- Jon D.