1972 D100 225 / Slant-6 info sought...

I found this "survivor" D100 on a ranch nearby for sale cheap. I relaize it is NOT an "A" body like our Swinger, but I was hoping for some help. It has a 225 in it with three on the tree and manual steering and brakes. I have enclosed some pictures to get some information on this particular engine/drive train combination.
1st, is the Holley carb stock?
2nd, whats the rear axle in this truck, same as used in cars?
3rd, what is the HP and torque numbers for this engine?

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