"Last option is what I have the question on. Correct me if I'm wrong, but the front brakes on my 51 6400 are the same as a half ton, those being Huck brakes? "

The 3100 & 6400 brake systems are distinctly different parts (in any year)

Also, in 1951, the 3100 front brakes are Bendix style and the rear brakes are Huck Style.

http://chevy.oldcarmanualproject.com/chevyresto/51134.htm

http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0501.htm

http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0503.htm