1st do a compression test to check the health of the engine.
I disagree with buying used parts here and there. I have found that when your building your car, If you try to save a buck, it will cost you 2.
by the time you spend the money on all the stuff, it will f**k up sooner than later and youll have to replace it.
go-autoworks.com has the best kits and a warranty. It will fit the 1st time, it is built with quality, and has all good parts. Just need injectors and tuning and your set.
http://www.go-autoworks-store.com/gostkit.html
i would get a dual core radiator and fan, and upgrade the clutch.