383 Help/Questions, Long Storage, Unknown Parts

I'll look for the side play specs, thank you.

Never heard of copper rods, now I can brag about them, it's got copper rods man, all 8, I'm a winner! People will think I'm a moron, lol.

I thought it looked lean.

the rods have been resized after copper coating
That is where the surfaces of the rod and cap are ground, correct?
For what purpose?
And how can you tell from the pics?

It appears a few rods have been ground on the ends, clean metal not copper, and some spots on the crank iirc. That would be balancing, correct?
blue bottle of STP on the cam
Sounds good, I think I have some PennGrade, maybe not, but good advice.
a little 20 weight motor oil in the cylinders to bring the rings back and run it.
Haven't heard that before, will do, thank you.
Maybe use a bore scope in the ports and plug holes to determine no accidental debris getting ready to beat a piston to death and run it, get everything freed/cleaned/oiled up/ran back in for the compression test.
I was thinking I need to make sure of that, even though it spins over without issue.

Is there a way to determine a few other things without pulling the heads and/or running it:
What the pistons are, they do look new, to me anyway?
If it has been bored?
If the oil pump is in good working order?
If any valve seals or a head gasket is leaking?

I know, stupid questions, just curious since everyone can pick out so much detail from just the pics.