68 panel truck Seeks Knowledge....341 Trans

[68 C-10 Panel]

Hi everyone, i hope that I am posting in the right area. The Suburbans and Blazers seem to be my closest relatives in the old truck world. Anyway I have this wonderful new project of a panel truck that I plan on restoring to original condition. It has a 250 inline six and a 341 three speed manual. Is this the original trans? I am finding little information about it on the net, the only way I found out what I had was thanks to one of your threads. I am looking for any information available and possibly some rebuild kits/parts when the time comes. Thanks in advance