I run the Comp Cams A6 X4 250H-13 Camshaft in my rig with decent results, but mine ain't all stock either. It's not stroked, but a lot of other work has done into other parts of the engine (bored, honed, ported, other head work, intake work, list never ends).
Here's the kit I'm using:
http://store.summitracing.com/partdetail.asp?part=CCA%2DK68%2D232%2D4&autoview=sku
Anyway... here's want I've been able to gather:
Your cam is spec'd to run best between 1200 to 4400RPM.
With mine being at 800 to 4800 it gives me a great mix of torque off the line and a great smooth idle. Your's being approx 1200-4400RPM means you're power band is shorter and your idle will be slightly rougher. However, it does make your cam good for towing and highway cruising at mid-range RPMs.
Comp Cams also does not recommend your camshaft for fuel injection... so I don't know what year you're planning on, but keep that in mind. Not saying it won't work, but you'll have to mess around a little to get you're engine to idle right.
From everything I've been told (nothing I've done, or have proof to back up) running a steep heavy (hot) cam on an otherwise stock engine will yeild about 12-18hp on the 4.0L. That'll change depending on the cam and other engine work.
Hope that helps some...
-Bill