No start backfire from throttle body

Have you rechecked to make sure the engine is timed correctly? Sounds like it is not timed correctly.

Rechecked timing checked fuel pressure got spark got injector pulse.

So did the belt break or jump time is that the reason why you changed it? or did you you just change it for maintenance?

ran hot got head reconditioned and changed timing belt.

Is it setting any codes? It really sounds like its out of time though from the back fire through the throttle body.