OMG need help fast

At 91000 miles your timing chain is trash. Yes, they will go just like that. I've had 3 or 4 that refused to start after parking them for the night. Hook up a timing light, plug the vacuum hose to the distributor, and fire it up. Let it idle and look at the timing marks with the light. If it appears to be moving back and forth at all, it's time to change the chain. You will need a 1 1/4" socket for the crank bolt and a harmonic damper puller to get the front cover off. You will not need to drop the oil pan but there are 2 or 3 bolts that thread through the front lip into the front cover. If it still wants to run rough, pull the pushrods, chuck them up in a drill, and see how many are bent. Had a '74 Charger that bent all 16. If you have bent pushrods chances are you also have bent valves.