What's possible on a 98GT with 94k miles?

[treedstang]

I'm looking for some input from you guys on possible mods for my 98gt.

I've racked up 94k miles my car and still runs like a champ. it doesn't leak or burn oil or nothing.

I'm still riding around with my factory clutch and sparkplugs imagine that I'm going to replace that soon recommendations on type of clutch and plugs please..

I was thinking of possibly adding 3.73's. I see some of your guys talking about swaping heads cams is that possible for me even with the high miles.

Basically what can I do to a 94k mile gt that won't require me rebuild the engine and still
enjoy the extra ponys?

any input will be helpful

Tim