So, I am ordering some $3,000 to $4,000 worth of parts for my car here in the fallowing week.

I am going to get a Cam kit. Stage II maybe Stage III. I have the E31 head. Going to get the cam put in myself with the help of a buddy hopefully. Though, I was wanting to put in the larger 260/280 Z valves. For these larger valves, where can I find them by themselves? I have not been able to do so. Also, how much of a bore needs to be done on the valve ports when I take it to the shop to get the ports machined?

check out Top End Performance @ http://racetep.com/

They will have everything you need plus they do great machine work.

If you enjoy turning revs, I think you should consider going stage III on the cam. It's not as aggressive as the name suggests. Unless you routinely go around street corners in 3rd gear I think you'll find the tradeoff of slightly less low end torque vs. better high rpm breathing to be worth it. I have the equivalent reground cam and it could easily be a daily driver.

Good analysis of the Stage III. It really is not an aggressive camshaft.