is this worth it?

I would say if you are handy with a wrench and can find a place to finish the downpipe, then go for it. I would try to get the price down a little bit.
If you don't feel comfortable tackling such a task, then ask around for some help locally. Get someone to give you a hand with it if possible. There is only so much help you can get online.
I'm a die hard KA-T guy, so I'm partial to them personally.

If you need anything, my contact info is in my profile.

dude thats scetchy if hes selling a 91 or later model with a SOHC engine..

looks way sketchy...the single cam swap? and i know if i was to sell a car with coilovers id definitely have a picture of it on the ground not on jackstands. but who knows check it out might be worth it when you see it.