What was the original application for that block?
what is the stamped code behind the distributor?
It was in an early Chevelle 64 I think. I'll have to check the code tomorrow. I do know it was a Counter Exchange engine. Has a CE in the code.
Remanufactured engines are often modified to suit more than the original application.
I have a 350 V8 that was remanufactured by Jasper that has been modified to accept both right and left hand dipsticks, for example.