Over heating 66 Dart

65 Dartman said
Factory AC/HD Cooling optioned 65/66 V8’s used a 17 in 7 blade fan with a shroud. As noted shrouds are hard to find and generally expensive when you do, Slants used a 6 blade 16 inch fan and their own unique shroud.

An 18 inch 7 blade fan should fit without a shroud which would certainly help.

I know plenty of people that run fine without a shroud but I know plenty that don't. He could try without the shroud first and try and save some $$ but if a 17" with a 7 blade fan is available, that's the best option by far.