Here's what I have:
1979 F250 4x4 with a 1971 460 out of an LTD. It has the original C6 with stock converter from the F250. The truck is on very heavy 2.5 ton axles with 6.72 gears and very heavy 53" Michelin military tires. The 460 has a cast 4v intake manifold and 650 cfm Edelbrock carb. The rest is stock as can be. Along with a cam kit, I will be getting a timing set and possibly a pair of headers/single chambers. As well as doing some extra gearing, I'm looking to get some more low-end torque out of the engine without increasing stall. I've done a good bit of research but wanted to get some educated advice.

From what I know and have read on cam choices for my application I want:

Dual pattern cam (more lift on exhaust to offset poor head flow)
Big lift (.500-.530)
Low duration
More lobe separation (between 112-114) which is less overlap

All of these, in theory, improve low end torque. That being said, I have narrowed down my choices to 3.

1) An FTE member's recommendation, 1,400-5,600 rpm range:
COMP Cams 34-235-4 - COMP Cams Xtreme 4x4 Camshafts - Overview - SummitRacing.com

2) A little less lift on intake, same on exhaust, less duration and more lobe separation, Idle-5,000 rpm range:
Lunati 316A1LUN - Lunati Hydraulic Flat Tappet Camshafts - Overview - SummitRacing.com

3) A little less lift on intake, a little more on exhaust, less duration and more lobe separation, 1,000-5,000.
Not exactly sure how .503 intake/.535 exhaust would behave but this one was worth looking at:
Lunati 61600 - Lunati Voodoo Camshafts - Overview - SummitRacing.com


Alpha's recommendation seems dead on but the 1st Lunati cam I listed has some interesting numbers too. Any input/advice/recommendations? Thanks!

Here's a picture of the truck:

 

Have you considered a small solid? Like in the .540 lift range and 276 duration. My truck has this cam in mine and been running for years. You have to occasionally run valves but definetly worth the little extra torque I'v gained. My cam was cut by MPG heads in englewood colo. by scott main. serious ford dude.

 

For the rpms your wanting a solid will help from my personal experience. Ran everthing from a 268 high energy to a xtreme cam. A comp 270 solid ran evenbetter than both of these cams and then I had MPG cut me a cam with a .540 lift and his custom cut/ramp rate upgrade in the 276 duration. My truck is daily driven and on 40's ground hawgs. C6 low gear kit and 472. 4.56 gearing. I need the low end grunt for pullin my mountains in the snow. Used to have a 3000 stall in this truck for mud racing back in the day. Now a hughes xtm 43 converter very durable. c-6 has a manual shift compared to typical automatic. My cam will pull out to 6500rpm but its goes flat around 6000rpm. 800cfm 1:1 linkage with some goodies. Annular booster carb. Help the lowend torque. Hope this helps catch you later.

 

Need at least a 750cfm. A annular booster carb is a must for low end torque. I would run even more like 830 cfm and a solid cam. A c-6 low gear kit is a definetly a good upgrade helps low end gearing in 1st and 2nd gear and factory in 3rd and lets you control your tranny a little more especially in the lowend range. upgrade ignition to multistrike to help with luggin situation. better combustion chamber complete burn with a MSD or similar type ignition. Been running a quick fuel carb for manyyears and been pleased with their carbs especially in the annular booster design. Catch you later. will talk cylinder heads and compression later.