Thanks guys for the insight so far, I have done a bit more digging and judging by the picture the engine is a 292 not the 289 he has it listed as. So one could assume it's the original engine. I must say this old truck has me completely intrigued, but at the same time kind of worried. I not sure if I am interested if the box has been hacked up and shortened. For those who have asked I am not sure if the tailgate is there or not. I can’t see it in any of the posted photos but could be in the box or his garage perhaps.