Joey,
I just did the MSD wires from Summit, and the Autolite 764's as well. I noticed a nice improvement in idle, and a tad more power throughout the rpm range. But thats because I drive my car ALOT, and I drive it like a get-away car, and I baby it. I noticed a slight increase in mileage, but the most significant difference, is throttle response. I dont know how, or why, but its almost as if the car got "chipped" as far as throttle response(our 95 has a SCT chip, so I know the difference in throttle response-Cjip vs stock).
Fuel filter, oil, coolant, battery terminals, JMOD(he-he, had to sneak that in), belt, and Mercon V are all important maintenance items. But $15.00 for plugs, PCV, and another $90 for the MSD(btw, they are the replacement wire for Cobra's...direct mod. No "custom" work needed), and you will feel the difference.
I know you already have a tranny cooler, so i wont even suggest that to you, but to everyone else...keep that Mercon V nice and cool, and your tranny will thank you!