Yes the .78 is the number. Some folks don't think its enough but for me it worked out in my 67 notch. The one thing I did to mitigate the converter slip is go with a lock-up converter but after driving it a year I had the transmission shop remove the lock-up feature. The car is much more driver friendly with a little converter slip and it only cost me 100 rpm. I now cruise at 70 MPH @ 2400 RPM. My motor is real short on torque, builder mistake on me:-( But for a 408 it will work fine.
