Seems like there's people who play it safe and run TR6's, pull 2' timing per 50 shot and richen the A/F's. Then there's others saying not to worry about anything until you hit a 150 shot.
I play it safe, rather than run the risk of blowing thru rings or melting something for the sake of 10hp and $15.00 in plugs.

 

I'd Stick w/ the tr-6s' and maybe tighten up the gap to 34 or go w/ Denso or AC Delco iridiums. I've got the tr-6's now, but for some reason my truck (and I) felt better w/ Densos than NGK.

Later...

 

t6 if it's not broke don't fix it.

 

TR6's gapped @ .035 right now...