72 cheyenne10 4X4 BIG BLOCK?

[Ricks1971]

I know that I have been told that 4X4's didn't come with a big block. I have had my eye on a 72 stepside 4X4 sitting along side a barn in the country for awhile now. I finally stopped to look at it. Its a 72 cheyenne10 4X4 stepside. Looks original it has air and a tilt column and when I poped the hood low and behold there was a big block under the hood. I could not open the door to check the blove box for info as the doors were locked. It sure looks orginal though. You all know I will be back to try and get the truck when someones around. could it be orginal? thanks Rick