Rob
Back fires means that you are getting gas and spark. still could be a timing problem.
If he engine didn't spin backwards, I doubt the timing skipped a tooth. But if it did spin backwards, it is possible.
Here is a sketch of what you will be looking for.
The red marks in the sketch above are what has to line up.
this is a real picture of an aligned crank.
To get the timing cover off.
Remove alternator and dry sump belts.
Remove harmonic balancer from crank shaft.
Remove 3 piece timing belt cover.
Check with Chad, I think he changed the oil pump with the engine in the car.
Bob