I had one of those - the wipers worked best when letting off the gas while leaving the clutch engaged.
The six volt system never quite suited me for reliability.
Sold the thing too early....
We updated the 6-volt to 12-volts. Horn really sounds funny because it's still the old 6-volt. Put a 1958 235 in it for oil pressure (216 had a splash system that wouldn't get oil to the piston wrist pins at speed). Other than that, she's as she was 52 years ago.
Wife loves the truck, but we do really need seat belts in it. Got a little one on the way and I haven't let her drive or ride in it since she got preggers. That truck'll be around when Junior needs a driving lesson.
It's perfect for teaching standard transmissions. Get them used to the clutch with the "granny" gear. It'll learn him real quick on the gas/clutch combo too (touchy accellerator). GRIN!