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here's what I did on my 81:
Accel cap and rotor, stock wires, AC Rapid Fire plugs, K&N air filter,Mobile 1 and prolong....it ain't a ZR1 but it is quick. All stock
I fitted a Performance Distributers cap & coil & some Moroso blue spiral wires. Ran much better afterwards, but that could have been down to the old wires being duff? K&N filter soon (when I stop spending on other things). Also fitted 180 stat which may have made it better, it certainly didn't have any bad effects, but our weather changed around the same time that I fitted it, so it's hard to tell.
Plug types seem to be a matter of personal choice (like in any engine).
:cheers: