New engines are kinda like that,,,,You just spent big bucks and a lot of time getting it running,,and you expect it to produce all sorts of power on the first drive,but most of the time it kinda disapointing.
Untill you get it broken in,valves adjusted right,(Tim) "timing set properly", all vacumm leaks sealed off,carb adjusted,it may "feel" sluggish. /forums/images/graemlins/dunno.gif
Give it time,make all of your adjustments in small incriments and only ONE at a time so you can tell if that adjustment helped. If you make a BUNCH of adjustments you can't tell which one helped or not. take your time and it will all come together. /forums/images/graemlins/waytogo.gif
BTW, you say it's "Cammin like hell",,,could it be that it's OVER cammed??? /forums/images/graemlins/whistling.gif /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif
Depending on axle gearing,tire size,converter stall(if automatic)carb size,intake type,and other things, the cam profile you selected may "HURT" your performance if it was not selected to work with the other components in the truck.
In other words,,a big high lift long duration cam in a 5500 lbs truck with 3.08 gears and 35" tires is not going to perform very well at all.
It may "sound " good at idle and lope like hell but will never perform in this combination. /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
BTW 2.73's / 282 .465 cam /800cfm carb, no wonder,,,,