V02 car I hope, would love to see the fender tag! I picked up a car myself in Winnipeg about 15 years ago and it was simple, probably not as much today but still shouldn't be an issue...
There will not be a full VIN on the core support,
lip, and package tray (where Dusters and Demon's are)
so you are SOL on finding out what the original engine was...
I bought a set of 340 main caps in a parts deal in Las Vegas las month, I will dig them out and see what they look like. Being that you are close I wonder if they are from that block?
I do have plenty of them, located in Rockford, IL. I don't usually ship parts anymore but if you can't find them let me know. They are the same from 67-76 on every A-body so there are plenty of them around. I am gone this week as I transport muscle cars and am going to the east coast...
There are headlight buckets and stainless trim rings that hold the headlights on and adjust them. The two square holes hold plastic pieces that the buckets screw too and the third threaded hole holds a spring with a hook...