72 cheyenne engine ????????

[STP67-72]

I am looking at a real clean swb 72 cheyenne . V-8, auto, p/s, p/brakes, cold air, front stabilizer, etc. The truck looks originaland has had 1 paint job on the outside. That looks like that is all except somebody added tilt,tack,rallys and duals. That has all been documented. There is folders on everything that has been done. The truck has 24500 on it and i think it is correct. The papers show when original man sold it in 85 and it had 10800 on the odometer.
The thing that has me stumped is it is a 307 2 barrel that looks like it has been there forever. Water pump and some rattle can is about all there is. This truck still has the original upper hose and all the original hose clamps under the hood. This is a nice-nice original survivor. I have had about a hundred of these trucks in all shapes and forms.But i have never run across this. My buddy said he saw a original super years ago with a six banger. I just wanted to know if anybody has run across this before. All of the paperwork shows that this truck looks like it is correct.
I am really thinking about buying this truck,but i am not crazy about 307.


I figured PICKMUP, WES, JOES JUNK, IRONMIKE LONGHORN MAN OR ONE OF YOU OTHER TRUCK GUYS COULD HELP ME OUT.

This is a NICE straight truck.