Sorry, the 2SS has 3.45 rear gears, not 3.55. But look no further than the 5.0 Mustang, which despite giving up 70 cubic inches, matches coupe to coupe in the quarter mile, mostly due to its 3.73 ratio.
I had a mechanic drive my car today, who owns a Hemi Challenger. He raved about the car, especially the interior design, the HUD and the handling ("amazing for a convertible"). His only negative: "Doesn't have as much pep as I thought it would...definitely less than my Challenger."
If anyone else has put in 3.73, 4.11's or anything else, let me know how it worked out for you.