The biggest thing is the trucks weight.
Keep in mind this is a 5,000 lbs. truck not a 3,000 lbs. street car.
I would cut some of the duration out of the cam to try and move the powerband down a little bit.
I would look more at cams that are in the 220 area at .050 area.
If you like Comp. then look at cam number 12-423-8 this is the largest cam I would ever run in your truck.
Next your heads are a little on the large size for what you are doing.
They are not bad, but again you are working with a truck.
Your combo. would be dead on if you had it in the 3,000 lbs. street car.
In fact I have the same cam on my bench but I had it cut on a small base circle to clear everything in a 383 I am building for a customer.
If you do want to use the larger cam you picked out with your heads, with the 3,000 stall then I would say go to a 4.10 gear to try and help the truck to move off the line.