Opinions are like bungholes, everyone has one. Here's mine.
Good camshaft choice. It's slightly more than stock of 263.5 Adv. Duration and .266 lift and should take good advantage of the lovely AMC cylinder heads by opening op flow at higher RPM without distorting the profile of the power curve too much. I'd be interested in seeing the overlap of this cam, because that's the biggest factor in the low RPM torque and idle of the engine. Stock overlap was 41*.
Intake is matched to the cam, so they'll speak the same language together.
The eddie carb will be easy to tune. Holleys are a little more involved to set up right. Neither is the best choice for a tow/haul truck. For that, I'd go with the new Street Demon 625. Tiny primaries for torque when bogged down, massive secondaries for climbing hills in low gear. Unlike alot of Demon's stuff, it's made for daily drivers, not bracket racers and is specifically designed to be a nice, well-mannered carb that is a sinch to tune and work on.
Don't really need the headers, they won't help you untill 4-grand RPM and can actually hurt you at low RPM. Plus, I personally hate the ticking noise they make. Factory non-AIR free-flow manifolds with a little porting flow almost like headers without the negative effects.
I'd focus more on durability than anything else. The core block will be working hard, so HD timing set. Double rollers tend to stretch early. Upgrade the lubrication system: Nickel plated timing cover, steel midplate, relief-cut gears, lifter valley and back of block oil lines (might not be needed, but they don't hurt), and sweeten up the main oil galleries. The smoother it runs, the longer it lasts, so get the whole rotating assembly balanced well. Should be nearly bulletproof.
Keep the factory valve covers or pay attention to the shape of any aftermarkets. The engineers shaped the original valve covers specifically to promote rocker arm lubrication.
Sounds like a nice motor already, so you can't really go wrong the way you have it listed. I just basically listed my dream 360.