Too many miles to supercharge?

Hi, fellow stangers! I've been wondering something for awhile... I have a 98 Cobra with 120,000 miles on it and it's all stock. Just the K&N filter and flowmasters. Runs really good, might use a half a quart of oil in 3000 miles, got the occasional tick from the passenger side head when the engine's warmed up. So my question is: would installing a supercharger be risky with this many miles on the car? I've been looking at a few of the 03-04 Cobras that I really like.. found a couple nice ones for 24 to 27 thousand. Think it'd be worth my while to suffer with a high payment for a car with less mileage and more power?
Just curious as to what you guys think on this issue! Another thing kinda off topic is that I've been getting a sulfuric smell when I dig into it. It's gotten way better since I switched gas stations. Is there any for sure way to test the converters besides the sniff test?
Hit me back up! Thanx...

Ah, yeah, I prob should replace those O2 sensors... the smell seems to have gone away after running it on a different fuel. So if a Mustang shop gives the green light and one of you supercharged yours at 125, then I prob won't have any trouble! Cool. I'm curious as to what brand and set up of supercharger works well with these engines. I've heard good things about Vortech and Paxton. What are you guys using? Thanx for the feedback, by the way!