I think I'd go with a '69 convertible, build a 421 HO into a Dual-Quad 440 with fully ported 455 HO heads, fully-floating forged, side-ground, shot-peened & heat-treated rods, forged flat-top Venolia forged pistons, Arma-steel crank, zero-decked block, gear drive & solid lifter cam, T-56 6-speed, Jaguar IRS rear end with 4.27 gears, global west front suspension, rack-and-pinion steering with active roll-control all around on 18X8 fronts, 18x10 rears with the biggest meats I could stuff into the fender wells.