With my 2.78 gears, those ratio's would be ideal. It would live behind my 350 but if I piece together a 9.6 to 1 403 or turn my 350 into a stroker, it would die quickly. I may be happy with it my 70S with the current 350. My daughter ran the 2004R low on fluid and cooked it. It had a 2300 stall in it. In my wisdom, I seem to have thrown out my 2500 stall TH350C converter. With the stock stall, it sucks off the line.