Overheating wowes that make no sense - help!!!

Sounds like it is running lean also needs a clutch fan with shroud. Shroud will force the air on block and water pump not blow it all over the engine bay. Twin fans will restrict the air coming through the radiator. I hope you got the alumin raditor with the larger cores... something like 1 ½. This will allow for more radiator fluid to be in the cooling system.

I installed a Griffin rad with two rolls of 1 ¼" cores (small block) and damn near added twice as much radiator fluid (50/50)mix than what was in the stock mopar radiator I was running. Made a huge difference. I was having the same issues with mine at hwy speeds... ditched the electric fan that was in between the rad and motor (puller) added shroud, stock steal fan and no more over heating. I currently had problems with the reproduction shroud (don't by these shrouds they will warp up so bad the will start touching the fan). I took it off because I was afraid it would fly apart and damage my new Griffin rad. Right off the bat driving around with a shroud the temps started going up again. I have a stock Mopar fan shroud from the early 70s but just not had time to install it but it really needs that shroud.

If you really want to keep the electric fans they need to be moving 5000 cfm minimum.

Oh yeah I run a 195 thermo and it can sit all day long idling and never get over 185 degrees (with the shroud installed and the stock steal fan pulling air through the radiator )