1989 Fleetwood Jambo Ford E-350 with 460 engine question

We had a 1987 460 in a Class C. You should be able to hear the fan clutch when it engages. First time I went up a small hill in the summertime I thought the transmission was slipping. LOL
I did have to replace 1 fuel filter. I also replaced the 35 gallon fuel tank with an aftermarket 55 gallon. Not too bad a job dropping the tank if you need to get to the tank sock.
I think I would have the radiator professionally cleaned. The misters sounds like a cool? idea too.