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Back fire is only caused by intake valve being open when a spark plug fires on a cold engine. Recheck timing marks of cams where the drive sprocket notch of each cam shaft aligns with the cam cap mark at the rear of the head.
It has been known for the crank sprocket to come loose on the crank nose and timing will be off if this is so. .
That could be a timing issues when it back fires Why ,no idea,not a question you can guess at as we do here Could also be a vacuum leak & lean fuel mix When you say cranks the motor turns over nothing else Cranking has nothing to do with the motor starting or running You have a no start & back fire as I gather
dose it backfire when you crank it over. if it dose your timing is off. If it dosent backfire when you crank it then look at all your wires and make shur you pulged ever thing in. and if you have one ground not hooked up that can cause a no start do you have fuel?
let me know and we will help more if needed
Get new belt installed & all aligned as it should be & do compression test before going any further to make sure. If good compression there in all cylinders, you probably dodged ( no pun intended) a bullet. Not 100% sure whether that is an interference engine or not, but will see if I can find out. By the sounds of the backfiring description, I'd be tempted to say you still have good compression. here's to hoping. Make sure when you get it back running that you keep a close eye on oil & coolant levels for a while just in case the backfiring cause some gaskets or seals to blow. Watch for difference between cylinders when doing compression test.