Spark plugs are white! Running lean? how to adjust timing?

[1jimmy__d]

Ok, I know I post the dumb questions on this site, but everyone here saves me tons of $ instead of going to the shop. Heres another one!!
I pulled a plug and saw it was white colored. My mechanic who installed the nitrous said to check it after i sprayed it a couple times to see if they were white, and they are. I know i need to retard the timing a couple degress, which means turning the distributor counter clockwise just a hair (RIGHT?) I am trying to get access to the bolt which loosens the distributor so i can do this but cant reach it with a socket set or wrench. Is there a smaller tool to reach in there to loosen it or am i just stupid and should be able to get it with the regular socket set??? Am i missing anything and does this sound right? thanks again!!!

jim