I've gone 12-volt mostly for better lights driving to work in the winter and having a modern AM/FM radio. The very quick starting with the original starter was a bonus.

Here's a picture of the $70 12-volt Sony radio in the glove box.
Note: The original radio has aftermarket knob bezels.

Old and New Radios Installed
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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.