I presume that when you use the word" snout ", you're talking about the pilot that fits into the crank, and not the hub of the converter that fits into the transmission pump.
If it is the small 1.550" diameter pilot, you probably will have to have one custom built. There have been numerous high stall converter builders mentioned in previous posts about high stalls that can get you what you need for your application. Typically on their website they will have a specification sheet for you to fill in to tell them about your engine/drive train combination. Give them all the right answers and they can fill your needs. This is the best way to get what works best with your combination. What works in my car, may or may not give you the same performance in your car.
Chrysler from the factory in 1968 and on made a high stall for the 225/318 904 combo that stalled around 22-2300 rpm. They also had a low stall for the same engines/transmission combo that stalled around 19-2000 rpm. I can't give you which vehicles had the high stall or which vehicles had the low stall. If you phoned our shop looking for a replacement stock converter, and if the converter was the original Mopar unit, we'd ask you which decal was on the side of it.
Shift kit wise, Transgo shift kits were the main ones I sold to transmission shops in the past. Never saw a B & M kit in any shops stock room.