Depending on the look you are going for, you should be able to step up to a 28" tall tire without issue. I love the look of the 255-60-15s on my Monte Carlo. Not sure you want to go that wide but the height is good if you can get it in a more narrow tire.
The G-body cars have an aftermarket air dam that isn't ugly or obscene, you might be able to adapt one to your A-body, but chances are that the a-bodies have a better aftermarket than the Gs.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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