The car only had 6 miles on it since the previous title transfer. It sat in a garage for that 8 year period.
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.
In hindsight it was probably not leaking.
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.
No, I understand the catalytic converter was new for 1975 model year. Mine doesn't have it.