I was wondering how hard it would be and what I would need to add turbo to my 280z. Do i just need new headers and manifold? And has anyone done this or know of a website that offers a guide of some sort? Thanks

Well for one...

SEARCH is very helpful especially on Forums....

you can also try www.zcar.com and http://hybridz.org

But don't even bother with an turbo swap into an 76 L28 engine..

got out and get an L28ET from an 280ZXT, only because the engine was buitl to handle a turbo with different compression, bigger injectors, and all of your piping for the turbo and intercooler is right there.

Find an old used L28ET engine.. and put it in your car, swap the turbo with a bigger newer one, and get an bigger, more efficient intercooler.

You will run much much power and your engine will be able to handle it unlike the '76 L28 with an turbo hooked on.