hi guys, need some serious help here.

1967 plymouth fury III 383.

one day driving down the road, a loud backfire then engine died, wouldn't start. so I had it towed home and have replaced the following since:

new distributor, new ignition coil, new fuel pump, new fuel filter.

still wont start. but I can feel it really WANT TO start, so close..... yet.....

I used the spark tester, has sparks to the plugs.

what am I missing? what else should I try?

please help.