hey Ric
for plugs try these
NGK BCPR7ES
there copper gapped at 0.8mm and extra cold (or something means they work better with more boost.)
can get them from marlows, auto 1, repco etc. about 4 bucks each and last for 20,000km or you can ask for the NGK iridiums that are equivalent to the coppers above. they will cost about $20-25 each and last about 100,000-120,000km.
Cheers
Troy
ps nice car