I would use the aluminum one. Looks better, runs cooler, is lighter and as you said this is a street only motor...
Trying to squeeze 10lb more tq out of the motor is not that big of a deal on the street.. I would invest in a good converter for that.. Something like the 10" street fighter from TCI...
2011 RAM3500
1967 Fastback Barracuda with some go fast goodies.