440 overheating at idle

That makes sense and is on the check list. I had a guy set my valve lash and he said I didn’t have a timing pointer on the car. (I am on the hunt for one as we speak so I can check the timing). I bought the cooling system from a local performance shop and they recommended the fan because it pulls huge amounts of air (Flex-tite maybe).

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No question pulling the fan back out of the shroud will help. Also, get a real fan, because that "AIN'T" one, I don't care what your "SHOP" told you. That's a toy at best. If you want to retain a solid fan, get a Mopar factory fan, OR a Mopar factory clutch fan if you have the room. It appears that you may.