You might try prepping the fuse ends with WD-40, Blue Shower or silicone spray to penetrate the rust. If it's really bad Ron Francis and Painless have replacement fuse blocks that do use the newer (and less robust) blade- type fuses. While my truck was down --waiting on a new harmonic balancer-- I had time to pull all the fuses, continuity test them, use a dremel on the contacts and scotchbrite on the fuse ends. A whole new set of fuses might be a lot less trouble and more reliable, but I like tinkering. You might also get another GM fuse box out of a wreck at a local junker. Sounds like your rig belonged to a snowbird once! '67-'68s are the same, '69-'72s have the lettering on sideways (BC of the handbrake deletion and change to emergency footbrake on the later mods.)
Good Luck
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