2800 is a lot of money for a 280z in California. I would keep looking. And jsm is Right u should stick with 1975 and back z cars due to smog. I have seen tons of cheap z's with in a 100-200 miles from here for a better cost that that.
This one lookd good
http://inlandempire.craigslist.org/cto/2241413127.html
I have a friend with a very nice 280z motor with 4 barrel holly and Arizona z store intake he wants to sell it switching to a rb25 pm me if your interested.
Toms Truck center has NPR intercoolers ... They are better than cx racing Id Imagine. You can find them on ebay or good them . Thats where I got mine when I had one.