What should i gao my plugs at? Stock 454 crate with 15,000 miles, carter 625 cfm carb. i dont know what would factor into this but what do you guys suggest? Also any tips for getting stubborn spark plugs out?

If you have HEI .045" gap should work well. Points like a spark plug gapped @ .035"

A little penetrating oil and a 1/2" drive ratchet set should get those plugs out for you. If they are stubborn, once you do get them out use a little bit of anti-sieze when you put the new ones in.

Mike