I'm not sure what you mean by suffix. If you could explain, I would like to know all I can about this engine before I tear into it and put it in my truck.
The numbers I have are;
Block casting: 3788378
Head casting: 3824435
Pad behind distributor: S19754
Rear passenger side: CON3 A 30 2
That's all the numbers I can see without stripping all the paint off the block for a closer look. If those numbers have the suffix you're talking about please do fill me in. Thanks.