I got a 79 shovel low rider and have been told by many people it's a stroker engine but I don't see s and a written on the jugs. There is something on the bottom of the jugs but I can't see what it is. Last number on it is 1235 but the stuff before I can't read. How can I tell what size this is. 80 or 96. Did stock have writing on the jugs?

Thanks
In advance and my apologies if it's a dumb question.

 

Just posted another thread with a pic and build details