Can anybody offer suggestions to the following scenario:

1. Wife drove car to diner and came back no problem.
2. Next morning, car won't start. It cranks but doesn't fire.
3. I don't smell gas so I replace main fuelpump/filter.
4. Car still cranks but doesn't start.
5. I pull plug #1, has gas on it. I notice corrison on end so I clean it and
put it back.
6. I crank engine, get a pop sound. Then a metal on metal grinding sound. Then
starter can't turn engine. That's where I'm at right now.
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I don't know why it won't start to begin with. Now it looks(sounds) like I broke a rod.
Should I:
1.replace the engine
2.take out the engine and try to fix what broke
3.buy a new car

Thanks,
Bob