@ Pharaohabq: Thanks for your extensive input.
If i have the luck to acquire the right Z, my plan will be restore it back to the way it should be and get the stock engine running. It will be my weekend car as i have a daily driver already.
I do have plan for a engine swap down the road, but until i got a real job, it not gonna happen . Anyhow, with that mind set, i really want to find a clean 280z as it have the R200 and of course longer, stiffer rails. Also the 280z have fuel injection which im more familiar with.
Oh well, i will post back how things turn out tomorrow. I might buy both and swap parts from the 280 to the 240 .