Jared, they had 998 engines in production in SA with the canister oil filter until '74. They were used on the mini 1000 deluxe. So it could be one of those?
I'm not sure if the vans used the 998 or 1098 motor at that time.
It's quoted as a 1380, that's why I'm curious.
Could it just be a bored out 998?