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Engines usually have a wide range of camshafts to fit. Some may be lazier than stock. Study the aftermarket options.
I'm not too familiar with your engine (V8s in general heh), but you may be able to find a variation of the engine with factory cam tuned for lower rpm towing/pulling etc. If it's a factory new/or common second hand part your possibly saving enough $$ over a bespoke item to make it worthwhile. Low end torque improvements are going to improve driveability for 95% of your driving. You should be able to keep the RPM down when climbing hills etc.
Go for the low end torque. Nobody needs more than ~200hp on the road anyway, even in some pretty big vehicles.
A lazy camshaft will reduce load on your valve/springs, you'll save some wear and tear and recoup a little energy lost to friction. You could even find the springs and rockers that go with the lazier cam, they may be lighter!
Also, it's been talked about on this forum and others but it may be possible to do a bit of DIY atkinson cycle. I've often thought a Atkinson cycle camshaft profile sounds alot like a high duration performance camshaft (at least when talking about the intake duration) that's been heavily retarded. Maybe there's something in that.
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