Re: cam for torque....110 or 112 LSA?????
I ran the 268H for SBC on my old 307. On that engine the bottom end made it feel like a healthy 350. The RPMs kept pulling well into the 6,000 range. I would imagine the BBC version will be designed similarly.
Comp Cams almost always uses a 110o lobe. I don't know why. I personally prefer a 112o or a 114o lobe on a street car, but I am sure a lot will disagree. They will both rev slower than a 106o-108o lobe, but my SBC 400 is not built to be a wind up toy, and neither is your tow rig. You get a better idle, vacuum, and response from a 112o-114o lobe.
Split duration/lift only helps when your intake/exhaust ratio is low on the exhaust side. You can research your heads to find out where yours are, but honestly I don't think it will be worth the effort on a tow vehicle.