Would a hood scoop help my problem?

I had a bracket car that had the same problem. No hood scoop, just an open element air cleaner. First run off the trailer would be 11.60s, then after that it would slow to 11.75-11.80s. I installed a hood scoop and a pan attached to the bottom of the air cleaner that sealed to the hood with foam so it only drew air from outside the engine compartment and it helped a lot. First run was still fastest but after the first run it only slowed a few hundredths and stabilized. I never did anything to kill the alt, fans or electric fuel pump.