It’s a lot easier to fix things, at home, before they break, than while on the road. While you can easily get to the upper components of the 454, injectors, fuel pressure regulator, distributor cap and rotor, and spark plugs, in this case; anything radiator related is going to be a bear.
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Now this oil cooler hose, which has been discontinued (parts nigh unobtanium), and has an M20x1.5 fitting because some genius at gm though it would be good to use part of the ac condenser as an oil cooler and is routed through 3 tight spaces that my hand won’t fit into, had to be cut apart and rebuilt.
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I can see an rv shop billing $3k for that work. Best learn to fix and maintain things yourself.