the option sheet doesn't specify the engine, at least not that I noticed.....like I mentioned before, there were only 3 options....and two of which were paint and interior

the other was a heavy duty clutch....can someone tell me how to tell if the engine is a 250 or 292?
I think I will be upgrading to manual hubs for the very reason of saving wear and tear on the axle components.....it should also help with mpg if only a little.
I will have pics to post thursday morning....just for my knowledge, is there a link that shows me how to do this, or someone who would like to offer to post/host these pics for me in advance?