Congrats on finding a 5-speed! They are just about as rare as hen's teeth!
How's the oil consumption? These 3.5's have a horrible reputation for that, but maybe you found a good one.
Use of a quality synthetic oil such as Mobil 1 5W-30 Hi Miles will help keep the engine's innards clean.
I bet it pulls even harder without the entire front drivetrain dragging it down!
What'd these have, about 215hp or so? Should be pretty snappy.
It might even beat my 3.4 LS in a race!