Never a bad idea to replace important hoses that are almost 30 years old. Nothing worse than blowing an engine to bits over .10 worth of hose.
I'm about to gap my CR42s into the garbage for good. I've been having some odd knock and rattling lately and the last 3 sets of brand new plugs didn't change a thing. I found an OLD set that came out of my '72 slant 6 in a bag under some mouse poop... Sanded the electrode, put them in, and the car runs better.
I think it's time for some NGK research now.