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Has the 440 been taken down and completely cleaned out? (hot tanked)

I know you said you put in a new radiator etc. but here is a problem I used to have:

Every '71 model vehicle that our family has owned would overheat. We'd boil out the radiator and that would help for about 6-8 months and then it would start doing it again.

What I finally figured out was that casting sand from the factory was in the water passages of the engine block and would eventually make it's way into the radiator and partially plug it.

It was maddening until I finally took a 318 completely down to the block and found all kinds of crap in it.

I know you said stock fan but is it fixed or a clutch type?

I've always run the clutch type and never had a problem.

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the fan is fixed. I'm 1000% sure it's NOT anything in the engine, it was tanked, ect... the problem is NOT intermittent, it's exactly the same, when ever the outside temps rise, it starts to run hot only at idle...