Originally Posted by snrusnak
If you're looking to tow then a cam and headers would help. I'd suggest smaller primary tube headers, not large primary tube headers as smaller tubes will promote better torque at lower rpms. You could do some headwork as well, probably wouldn't go larger on the valves as you might lose some low rpm torque, but some minor porting/polishing will give more torque at all rpms.
Sean, bigger valves themselves do NOT kill low end torque. Sometimes they improve it. I've never tried that test on these heads but I bet it would improve, based on the rest of the intake equation being so inadequate.