85 300zx engine swap, need upgrades/mods

i'm pulling the engine on my 85 zx non turbo and half the clips on the injectors are busted now... lets just say i was a little aggressive in their removal. neway, i thought of this as an opertunity to upgrade...

Question 1: whats a good electronics upgrade i could throw on it?

Question 2: now that its guts are spewed about the garage, are there any inexpensive mods i could appy before i put it back together?

Question 3: where can i buy aftermarket goodies for my make/model

thanx for the advice