I need some help with an old Dodge truck.

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This is a customers truck I think it's a 46..
It's a rare four-wheel drive...
Anyways he got it about 18 years ago and just after he got it he got an engine for it that he said he trickled a little gas and and heard it fire and run...
He had the brakes rebuilt at the axles but that was it. I showed him how to route the brake lines and told him to get a new master cylinder as his old one was very toast. It's 6 volt reverse polarity positive ground. And yes every one of these kind of worked on crank kind of slow... The battery reads 6.25... and they don't die easy... After he swore nobody ever touched the wires I finally figured out that all the wires were completely crossed..
I got it firing and running and got his brakes working for him..
The pictures depict the day we finally drove it for the first time since he owned it in near 20 years and actually got it running months before that...
That is a 39 - 41