What rpm does 3:91 gears give at the end of the 1/4 mile

275/60 Mickey Thompson drag radials 28.2” tall, trans will be a 727 auto trans. I don’t know the percent of converter slippage, I bought a street fighter TCI-142200 3000-3500 stall speed converter.
I see you edited your original post. Well, do you plan on your car doing 95 mph or 110 mph when you cross the line ??? If your car is a slug, your RPM's will obviously be lower. So.... lets say it this way.....
100 mph will be about 4700 RPM's with ZERO slippage of your converter. I promise you that TCI converter will be slipping plenty, how much I don't know. But at 100 mph you'll be over 5k rpms for sure.