New 383 wont fire

looking at your crank gear, there are 2 grooves for the slot on the shaft....is it possible that the gear is on wrong making the timing off? if so how do I know which is the correct slot

No those those are for retarding or advancing the timing the engine in the pics is
Mechanically in time

Cuda, he has a point. If tommy has a 3 groove lower sprocket, you MUST be careful that you used the correct timing mark on that sprocket

I don't know whether the one below is bb or sb, but notice that you go by the simbol on the key and if you are using that key, they us use the corresponding timing mark

In the photo you can see the near key has a "O" and there is an "O" mark CCW from the key. Around the "bottom" you can see that key has an "A" and that there is a corresponding "A" further along.