2 door Merc ?
Find a 2 door mercury monarch Shorter and lighter,, then a pumped 427 stroker SBF, SWap the lincoln front clip, Use the 9 in Disc rear end, the Hydro boost 4 wheel disc really makes them stop. the Versailles I had came with a factory installed sub frame kit. You mighe have to modify to fit the 2 door. Add 1 X 2 Rect tubing under the rockers and tie it into the sub frame. larger sway bars. Use late model Mustang GT brake calipers on the front.