What parts do you seek?
I saw a p/n 7827030, ignition switch actuator rod go for 22.00 on ebay a couple months ago. Discontinued from GM. The dimmer switch rod is 7820030 and it's discontinued too. There is one on ebay for 70.00, I think that's what it was. Way too much IMO.
7830380 is the ignition switch with keys. Delco #D1403B. Saw them on ebay….cheapest one I saw was 24.99 shipped. Good deal actually.
EDIT: I saw you had bought another ignition switch. Is it the right part? Just asking.
9990116 for the tilt ignition switch itself on the lower colum. Delco #D1405B. Still available from GM. Ebay sells em cheap. Around 15 bucks for the cheapest Delco one I saw. If your car starts, I doubt this is your issue, OR your neutral safety switch.
Sounds like it COULD be your ignition/key tumbler giving you problems. Worn key can do things like that as well.
All the parts above fit 80-up and sometimes earlier tilt wheels. Pretty much standard parts for the most part. But if you find out something's broken, come back here and ask. Someone may be able to find what you need.