I'm putting 9hp and 14tq more to the ground than another thunderbird 3.8L with the supersix package, less than 1200$ into mine also. (BOTH cars where dyno tuned)
I would expect to pay about 14-18hours labor to swap in all the parts, which costs $$$ by the time you got done buying the supersix kit and pay someone to do it you could have bought a vortech supercharger kit and make slightly more power than the stage one SSM kit provides.