Plugs out !!!!! free turn and then compression test, this will tell you straight away if youve broken anything, the engin will rattle like a pig when miss firing, also fyi next time you re build fella leave the fuel and spark out of the mix until your oil light goes out on the starter, up on hte rear paddock into a low gear if you can and turn the engine full cycle, only when your sure you have compression in each cylinder would you put the plugs back in, you may have debris in a plug gap so ideal time for a clean and check for spark then make sure all timing marks have not moved or jumped teeth, check and check again, your lucky if you get a second chance dude, I would offer help but I am so busy right now and wouldnt want to let you down.
