Maybe someone has run into this before.After i bought the truck a year ago i had to replace the heads (new rebuilt heads) and found that when i got further along that the cam lobe on #6 was completely worn, no lift whatsoever.i didn't have the time or place to replace it so i got a mechanic to replace the cam and lifters.it had a miss before,but chalked it up to the cam.after the work was done it still had a miss to it.i put a new quadrajet on it because i'm trying to stay as original as i can,and the miss is still there.so what next?!i was thinking maybe bad valve on the new head,or distributor,but the miss has no rhythm to it (i.e. 123-miss-5678) it is sporatic.correct me if i'm wrong,but if it was the head or dist it would have a miss at the same valve or point on the dist over and over!the only thing i can think of is fuel.new lines,tank,etc.anybody have any suggestions?Thanks