I've seen this discussed elsewhere on these pages. I think it was the 4-cyl Metros that had the tallest gearing, let me look...
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I'm back, and I brought gifts.
MetroMPG wrote in his blog about "nerd gear," and described, among other things, the various final drive ratios the went under the Metro's hood:
Project 'nerd gear': taller tranny transplant nets +5.2% MPG - MetroMPG.com
This is just me but I have my doubts that your car will have the muscle to swing the 3.52 final. It's pretty darned tall. If you do serious aeromodding and weight reduction then you could maybe swing it.
This thread points out that at least one swapper making the change found the new driving envelope intolerable.
I've also seen another thread that talked about a new fifth gear and leaving the rest of the box alone. I'll look for that and post it when I have some more free time, if someone else doesn't beat me to it.