Thanks, Guys,
I snipped a wire from that tinned, flat link so I think it's a plain conducting jumper. I'll mount this on the firewall and use fusible links from it like is shown on the Mad Electrical page. Their power block is reasonably priced but I gotta watch my pennies.
There are a gazillion of these power blocks at the junkyard. I got mine from a truck that still had a hood on it so the block is in pretty good shape. Some showed some minor rust.
Thanks, again.
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.