"Replaced cam and crank sensors
Replaced spark plugs
Replaced fuel regulator
Replaced fuel filter
Replaced fuel pump
Replaced fuel pump relay"
Instead of just replacing parts, should have done some diagnosis.
Basic is: Is there spark? Then, if spark, is there fuel? IF both exist, then is spark occurring at the correct crankshaft timing? Is fuel pressure correct?
Since the engine was running/car driving, prolly just one problem... one part to replace...