Is the terminal itself clean and shiny? if it's corroded that could create an intermittent situation. Polishing it up with a pencil eraser may help, it's not abrasive enough to damage electrical connections and since a pencil is long and thin they''re good for reaching into tight locations. They can also lose their springiness so they don't make good contact, you could try bending the terminal a little. I'm not sure if there's a modern terminal replacement that will fit, hopefully someone else knows of one.
The 1961 Catalina I had when i was a kid had similar problems with intermittent connections, thankfully the fuse block in the Bonneville I have now is good.
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