Want to say hello and had some questions

[RatRodBrett]

Hello, I have a 1966 1/2 ton c10 long bed step side Chevy truck with the L6 250 straight six and the three on the tree transmission.The problem I have is that my steering column. is wiped out and the trans leaks bad ,so I bought a rebuilt 3 speed top loader manual trans. from a friend only to find out the new one is shorter with no tail shaft.He has the long one piece drive line 56 1/2" long on the shaft but wants to keep it.My truck is not set up for the carrier bearing two piece drive line. I would just have a drive line made but I will be going to a V8 this summer and already have a turbo 350 that I have had already built. The question I have for the board is what year of Chevy trucks and ton rating have the one piece 56 1/2" shaft ,1/2ton rear end ,and 3 speed top loader manual transmission. Thanks hope you can help me.