I have a bung on each side. Do I have to do a separate run for each side??
I see a two runs of 15.4 and 14.7 for the RT and the car had the Cleaner Air Package Lots of these cars ran well into the 14s. Don't settle for less!
Reading the article I caught this: "Both cars came with the standard 7.75 x 14 Red Streak tires, and running them this way with two aboard and test equipment netted best quarter-mile times of 15.4 seconds and 94 mph for the Magnum."
You're talking 4-500 lbs of extra weight here, or .4-5 seconds. With CAP.
You do need to look closely at those old track tests. What you describe was common. Actual test weight could be as high as 4300 to 4500 lb.
Aren't 15x7 steel wheels with 255s heavier then the original wheels? I admit traction may have been an issue with their times and with me not breaking loose times should be better.
Lots of these cars ran well into the 14s. 
Don't settle for less! 
