Max Torque Big Block

I was at the dyno shop today with a 540 inch big block that made 700 ft-lbs of torque at 4000 rpm and 600 hp at 5800 rpm. It is going in a mud bogger truck. Probably too hard core of a build for a motor home but it gives you some idea of the torque you can make. We tested a 520 inch BB Ford that was built for a motor home late last year. That engine made 600 ft-lbs of torque at 2500 rpm. It had a very small hyd cam in it and stock cast iron heads. I think it made around 400 hp peak since it was built for low speed grunt not high speed power. Something like that would move a big motor home down the road pretty well.