Not sure on the smog test in Fl we don't have emissions, sounds like u have done some of the best mods to the limited,, 3.2 v6 .
the reasion i bought the C320 wagon it has the same 3.2 v6,,rear suspension and a some interchangable interior parts. some of the engine parts that interchange with the v8 is water pump, alt,,some pulleys and the belt ,, you see the V8 has two engine belts one for the accessories, and one to drive the supercharger.