Fuel injectors not firing.

Just recently had my head resurfaced at a shop, I labeled all lines, vacuum and injector lines as well as electrical connectors, now that ive put everything back together I cant seem to get the injectors to fire. I took out cam shaft for new seal and one the cam itself theres a dowl which lines up with thew belt pully, do I need to correct this, can it be out of timing? I have spark at the plugs I checked that, all fuses are ok. When im cranking the engine it puffs alot niot smoke just the noise I also tried just pulling off fuel rail and seeing if the injectors are firing fuel they arent so im assuming thats my issue? Please help.