340 duster will not start after storage

this is actually my 2nd posting about this. having trouble starting my 73 duster 340 after sitting since November, primed the carb, pumped the pedal, no fire up. oil pressure is up, battery cranks good. any how I just had a guy that works on classics that if I keep cranking this I could wreck the lobes on my cam! any truth to this? this car ran and started good when I put it in the garage. nothing was touched, now no start.so this cam thing is really got me going. any body heard of this happening? now I am nervous about even cranking the motor ! still have to check spark by the way.