Time to rebuild?

1) Were there any signs the engine had gotten hot prior to your purchasing it.(new rad,thermo& gasket,recent flush tee, hoses etc)?
The car only had 6 miles on it since the previous title transfer. It sat in a garage for that 8 year period.
2) I have seen decent compression readings & piss poor leakdown readings, it doesn't automatically mean the rings are fine at all.
3) Does the engine stall immediately if You pull the PCV out of the valve cover, & is it difficult or impossible to restart like that?
Nope. If I pull the PCV valve out the idle drops slightly but quickly recovers. It starts the same with or without the PCV valve connected to the valve cover.
4) Did You in fact have a leaking fuel pump diaphragm, or was that a dart at the wall guess?
In hindsight it was probably not leaking.
5) How experienced is the tech doing this checking for You, esp. old school units.?
They do a lot of work on classic cars at this shop. The guy doing the check was youngish, but the owner is very experienced and told me he is SURE it's the rings.
6) Does this car have the catalyst on it?
No, I understand the catalytic converter was new for 1975 model year. Mine doesn't have it.