If the #'s were accurate, no doubt in my mind that the SSR would smoke him. It all comes down to power to weight ratio. A conservative guess puts the SSR at 420 RWHP, 400hp stock minus 80hp for drive train losses and add 100hp for the magnacharger.
Dodge 3500 8000+lbs 475 RWHP = 16.8 lbs per HP
SSR 4700+lbs 420 RWHP = 11.2 lbs per HP
No doubt the SSR wins unless you miss a shift!