New to 340 so I have questions

AZ-Nick said
good question, I am still trying to figure that out too.
The odometer reads around 64k, but that still doesn't mean anything.
The heads are X heads, that's for sure, I spotted the X immediately.
I want to check the block, I was told to check it like a big block at the pan rail, but I can't get on the ground to check it because of my bad hip and knees, (Replaced) it's too painful and I can't get up.
I was told to check the casting number, but I can't seem to find it because of the header in the way.

Next time you take it in for an oil change ask the mechanic to snap a pic of the casting numbers right above the starter on the drivers side under cylinder #5

On the passenger side there is a date the block was cast, it is towards the front right under cylinder #2 where the block meets the head