swapping 5speed to Auto for race purposes only

How much time do you expect to shave with the automatic?
When you say crack the 12's what ET are you looking for? Is that into the 12's?
It seems to me it shouldn't take much for a 5.9 to get into the 12's.
Into the 11's is a lot harder.

In used to do that swap twice a year; spring and fall, 5 years in a row. 360HO in, in spring with an A833, and swapped out for a 318/something else, in fall. That 68 Barracuda was my DD. Boy I was glad when I got a better paying job and could afford a second car. I was 47 when I started thatchit.