It's not hard to do the math. The weight and the wind will spell it out for you. I know my truck has a 12.9, it went 13 flat first time out against a stiff head wind. I know people there and their CARS were off ET/MPH, so I know my truck was. Now, if you give it a tenth per hundred pounds, plus the wind resistance, 12.4's should be pretty average in a 3k pound A-body.
