Re: Better 3.5??
The best 3.5's I know of are Boston Acoustics FE3 (old model) or SE35 which are getting rare now that BA is out of car audio. I tried a bunch of different 3.5's in my Olds and the Bostons definitely held up the best. Most of them only take 15 watts or even less. If your Cutlass is like my Delta-88 the speakers mount to the grilles and you will have to modify the mounting to clear the tweeter, and maybe even have to widen the dash opening a bit to fit the magnets in there but it's worth it. You will have to hipass them at 150 or higher.
1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25
Sub Stage: In process (will be Boston G310)
Amp: Boston Acoustics GTA-704 4 Ch
Rear Fill: Boston SE953 6X9's