That will depend on the torque curve of both engines. Peak torque does not really tell the whole story.
IMHO you are going to have to wind the 6.0 SB more the get the power out of it. The V10, not so much.
That being said, let it wind. SBC love to wind......Even BBC do. I take my 572 to 7K.
Wind it up and let it eat and it will get the job done for you. If you are timid you will feel it is down on power.
As far as the V10 goes. You got a dud. The V10 is a great engine. You can pound on those things 24/7 and they won't blow up. Like I said, you got a dud.