You say you need to replace most of the wires so I'd agree with hull. Plenty out there to choose from but you might as well get a new fuse block with modern fuses and enough circuits to do what you need, plus maybe a few extras.
My fave are the new fuses that have a small LED that lights when it blows, makes it a no brainier to find the problem.
'69 1/2T stepside, Sea Foam Green, 250 L6 w/ 3 on the tree, not an option on it, in the family since new.
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