I use the Nippon Denso plugs available from Toyota(for lexcen), i find they work better and last longer than the GM ones, they are about $3.60-$4(got mine for $22 a set)depending on dealer, i just did mine on w/e , had bosch super in b4, they worked pretty good, but getting bit old now, just remember the right order of ur leads and ull b right, i got mine set to 1.5 as specified on the left strut tower and by Nippon Denso for my engine
also be careful putting new ones in not to cross-thread the hole in the block(very $$$ to repair), and not to bend the plug or crack the white ceramic insulator as i leant the hard way, did that in the vp , started it up , was missfiring, backfiring, drove like **** but had to buy a new plug , all because i bent the bit that connects to the leads on one plug