As said go straight to stage 3 stuff as listed, pump rewire, and FAN rewire.
Give it a good service, make sure the fuel filter is new or changed.
Up to you what chip to use, there are chips at least as good as MSD, but whatever look to someone who can also do a set up, ie fit the bits if you can't yourself, and do a on load fuelling check, most important, and worth travelling for, you could just book it in to have the work done and have a faster drive home!!
tabetha