[Excaliber]

Save the bottle for 3rd or 4th. In other words, use the NOS after the 1/8th mile as that seems to be where you really need the power.

As I recall the near stock ET times for a 289 Cobra and a 427 Cobra were both in the low 12's. The 427 was faster, but not by 'that much'. But the top speed (trap speed) of the 427 was significantly higher than the 289. Small blocks wind up fast, good hole shot, good 1/8th mile times, but tend to run out of breath toward the end of the 1/4.

Cars like the "Dragon Snake" 289 Cobra were full on drag race setup with ultra low rear gear ratio (5 something) and did run in the 10's, naturally aspirated!