Which spark plugs?

I have not have good luck with the autolites for some reason on my cobra I just put the stock motorcraft platinums on and it made a big difference powerwise and gas mileage I went through two sets of autolites to prove this I had hard starts with the autolites after 2,000 miles but you pick maybe its because of the gt40 heads everybody else runs the autolites on the stock heads with great success but not me

plat. plugs are prob. the worst IMHO.

I run a ngk Tr6 that is one range colder for the bottle. I am preaty sure the stock plug is a Tr5 or maybe its a Tr55.

When in doubt, you can't go wrong with motocrafts.

Motorcraft or Autolite.

i thiought the motorcrafts were autolite?