Does anyone know which spark plugs I should use for my application? I have a 94 cobra with a fresh 306 with low compression pistons, Trick flow track heat heads, Vortech S-trim 10-12 pounds with powerpipe, Msd ignition with boost retard, 255 intank and T-rex. I used to have the cast iron gt 40s but switched to the Trick flow and now I don't know which sparkplugs to use. I would like to stay with Autolite since I had no problems with them on my gt 40s. I know you are supposed to go 1 or 2 steps colder than stock with a charger but what is stock with these heads? Need to buy spark plugs arlready so any help would be appreciated.