Cope says torque
which means torque at the rear wheels....
After it comes out of the trans and out of the rear axles....... so it really means TM/ Torque Multiplication.
With an automatic, that must also include what is coming out of the TC..
If you had an automatic to go with those 3.91s, your TM might be
Crank torque x TC ratio x2.45 first gear x3.91= say
400 x 2.0 x 2.45 x 3.91 =7663 ftlbs. But with an A833, it looks like
400 x 1.0( noTC) x2.66 x3.91=4160 ftlbs. or about 54% So don't hold yur breath.
What you need is a Commando box and 4.30s for
400 x 3.09 x 4.30 =5315, or about 69%
But hang on; that TC ratio of 2.0 is gonna diminish the instant that the car starts to move. By the top of First gear, it might be down to say 1.2 ish, so then 7663 becomes 4598.
But wait the torque is not a fixed number but changes continuously with rpm. So 30 ft out say, anything could be anything, and you don't have a convertor anyway, so all this is relatively useless information.
For low ET; You gotta gear your car to trap at a favorable rpm, so that Fourth gear can put the power down, on that long long haul to the traps. That means, with a 4-speed, whatever you get out of the hole is whatever it is. If you don't get enough air to satisfy your craving, yur gonna need a bigger engine. Or at least, more torque. Or maybe a Torque Convertor.or a power-adder.
But without the other factor Cope mentioned, namely "traction"; if the tires spin yur screwed.
I might have a better question and it goes like this;
What do you have to do to your car, to get yur 60ft down low enough, in order to get X-amount of air under the front tires.
I'll go first
2.2 to 2.4= zero air, lol; but still went 93 in the Eighth.