What 40 posts on this thread, and no one has yet mentioned the Mercury Marauder? This was a limited production version of the Grand Marquis with a hot engine and the suspension mods neceasry to better connect that power to the ground.
Panther chasis has been a good car for FoMoCo, rock solid, reliable, isolated ( maybe too isolated). Steering feel was non existent on earlier versions, but has improved in the past couple of years.
One of my "bench racing" fantasies involves putting a Lincoln LSC IRS under a Crown Vic, or GM, and installing really stiff shocks to dampen the motions of those too soft springs. It would cost more than it would be worth, but I bet it would be a sweet ride.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags