408 Magnum stroker running hot.

Sounds like you covered most of it.

Do you have a hood to radiator seal? And a cowl seal? They will help direct air where it needs to be.

I have the factory hood seals. Nothing additional.

I dont know how a mechanical fan would help my situation. But I'm open to try one. I just don't know what clutch/fan assembly to use that will thread onto the magnum water pump. Thats about the only thing I could try different.