383 overheating

I gave Greg the # for Valley radiators in Canton yesterday-he called me today says the rad is out of the car and he started flushing it out. He says he can hear all the crap inside slushing around when he tips the unit back & forth, and was able to coax some of the thick sludge out. This stuff was aweful, like from the bottom of a septic tank. He told me he was able to see some of the passages are completely blocked off as well. He'll be bringing it to the shop Monday 1st thing , I think the problem is solved here .
I kinda hope he goes for a new 3 or 4 core and a better quality core.