Looking for some pointers/arcticles on building a 455 Olds for torque/towing.

Looking for reliable power, the engine is for my 53 Ford F350 Dually. I've got a couple of core 455's to start from. Couple pair of "J" heads, quadrajet stock intake. So basically a late 70's smog motor.

Cam seems easy enough, there are some 4x4 cams avaliable that have a good low end. What I'm wondering is it worth messing with the heads if i'm not looking for high horsepower, any cheap easy gains I can get through piston or other part choices?

thanks

Chuck