As far asI know there was no engine change, or mods to the suspendsion. I did have some photos of them, they they were lost during one of the hurricanes that hit us here.
One more note that I remember about them, Tires. I saw them with at least 3 different tires. I have seen them with the jeep tire stock 700:16, with a wide spoke rim painted black, do not know the tire size, and the stock rim with a 750:16 tire on them. I have,....I "think" 3 of the 750:16 tires and rims off a super jeep. I friend of mine got a couple of the super jeeps at DRMO, but as you know, the M151 series had to destroyed at DRMO, and when you won a bid on them, all you could do was strip parts and leave the jeep body to be crushed.
I also have the dash mount off one, but when I find it, I have already promised to a guy in England.
One of the few, Frank USMC RET