9.5" Dynamic converter here, 4000 flash with my old 360 motor and 4.10 gearing, used in my Dippy coupe for about 90% street and 10% strip (if that, to be honest).

That is how I spec'd it, that was what was delivered. I was worried about it making all throttle response in street driving completely "go-away", found out that it wasn't the case at all. Yes, the throttle is looser, but no complaints. In fact given the combo I had at that time, going to that converter from the previous 2800 stall piece was precisely what was needed!

I did run a cooler (stacked plate one), and a deep pan.