Yes, this subject has been beaten to death to say the least. So much so that it hardly provokes much response these days. If you read those threads you'd know everyone has their favorite plug for whatever reasons depending on their particular build. Ask 5 people, get 5 different answers... Lol.
Assuming you have iron heads, Autolite 24's or AC Delco CR43TS gapped .035 for under 20psi. Autolite 23's or AC Delco CR42TS gapped in the lower 30's for over 20psi. If going over 20 I'd try closing the gap .002 - .003 for every 5psi increase as a general starting point. Its not an exact science. Results may vary. Some don't like the AC Delco plugs anymore citing quality issues but that's what I've been running lately without problems. NGK UR5 is another popular choice because the quality of the plug appears better. One note on NGK plugs,,,there are made in china knockoffs floating out there. Look it up. Lot's of guy's geek out over what plug is best. FWIW, I have run all of these brands at one time or another. I did not notice any difference between them. But maybe its just me.. The important thing is stay away from those latest and greatest, fancy pants plugs - platinum, iridium, whatchamacallit's. They are not for Turbo Buicks no matter what anyone tells you.
Plugs are cheap and easy to swap out. If you really want to know which plug runs best on your car get a few different sets and come to your own conclusion. You will likely find very little differences, if any, among the popular choices especially on a stockish build.
Now that I wrote what I wrote watch everybody tell me I'm wrong and start listing THEIR favorite plug. Lol.