I have the bench-top version of the 7603. It's a serious, lab-grade scope, but getting quite long in the tooth. I wouldn't pay over $100 USD, and that's if I needed a 100MHz analog scope. But from the pictures, everything's clean and in good shape. A matching set of good probes would sweeten the deal considerably, because you'll need them anyway. (Although the deal doesn't get much sweeter than free!)
The onscreen readout is a handy feature of the 7000-series scopes, and an advantage over portable scopes like the 465. The 7A26 (200MHz dual-trace amp) is a good complement to exploit the full bandwidth of the mainframe. Do note that the 7603 is physically massive for a transistorized scope; the bench-top version is 23" deep.
The 7L5 spectrum analyzer is likely to be of very little use for RF, marginal even for the AM broadcast band, but it might be interesting for audio. I have a 7L12 (IIRC), and those analog spec-an plugins are incredibly complex and cranky: lots of shielded modules, lots of coax interconnects, lots to go wrong and inject spurious interference. The ancient digital storage makes things even more interesting. There will be a learning curve to interpreting a useful result from the captured signal.
Congratulations!