The ones from those years that would be worth grading are normally the Hall of Fame rookie cards (plus a couple of extras) like Mattingly. Expect that if they look perfect to you, they might grade anywhere from PSA 7-10. Most modern cards are only worth grading if they attain a grade of PSA 10. Centering is an issue, so is scratching, so is foil and holograms. Corners are not the only factor. PSA has a page on their website where you can learn about what defects reduce the grade of a card.
Feel free to scan some in (like the 1983 RCs of Boggs, Gwynn, and Sandberg) and we can tell you if it makes monetary sense to pay for grading.
Look through the sets for some of the valuable errors/variations (1990 Frank Thomas no name on front, 1991 Topps Oil Can Boyd full ribbon, etc). $10 was a heck of a deal for a complete 1992 Topps Gold set.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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