1973 C10 454 Question

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I am zeroing in on a potential purchase of a 73 C10 with a factory 454. I haven't laid eyes on it in person yet, but I have seen a fair number of pics and videos.

Unfortunately, the truck has been repainted from Catalina Blue and White (my favorite) to red, probably several years ago. There appears to be a cab corner repair that is starting to show. Rockers, floors, bed floor and wheel wells look pretty good.

Thoughts on the ZN7 optional axle code? I understand that might identify a higher gearing than the standard ratio.

Because it's a 454, does that automatically get the heavier frame (F44)?

It has rally wheels, but I don't see that on the SPID, so I'm guessing they were added later.