Stock Magnum EFI 1/4 Mile Times in an A body

It gives at least a "rough" idea.
I agree. I use that math with my own cars to see what "potential" there may be. Stock eliminators usually get on the other side of that math - meaning going faster than that math. If I can get a street tired/highway car to go within 3 tenths of that math, I feel the car is working pretty good.