FYI: These older engines respond better to copper plugs, but its up to you. I would use copper.
AS far as chips, as long as they are brand name chips (WAR, TMS, etc.) you will be fine. You must use 91 octane fuel or higher wen you get a chip since all it does is re-map the fuel controls to work with higher octane gas as opposed to the stock chip which optimizes use for low octane fuel.