identify my truck

[BradStatz]

Bought my truck about a year and a half ago off Craigslist. Was told it was a 1970 c10 body sitting on a 1969 k20 frame. As I started tearing it and learning more, I realized I had more questions than answers. Things I know from researching this site for hours: truck has a Dana 44 front diff, a Eaton ho52 rear diff with a 4.09 tag on cover, a 350 v8 from a 1978 Chevy bus, front disc brakes, rear leaf springs, a Muncie sm465, and a np205. Is this thing a " franken truck" or other than the engine(1978) would all of these items been original to the truck.