Heh, sounds like my town
yeah there's stuff for em, but for the love of god do engine mods first, and don't rice our your lude, show some respect for the car. Frankly there is nothing MORE cool than a fast ass car, doesn't matter if it's missing a fender (if it's fast ENOUGH), that's an exageration but you get my point?
That way you pull up next to those stangs they see this (perhaps faded paint or something?) basic looking look, you gun it and kick the shit out of them, then you can laugh at them
But yeat there are kits for 3rd Gen,
www.extremedimensions.com that's one place I browse, they have for 3rd, 4th, and 5th gens.