1997 Honda Odyssey Engine faulty? Ran

Accidentally ran engine low to no oil (dipstick showed a dot of oil on the tip) for more than a week. Discovered had 3 of 4 spark plug wells filled in a pool of oil. My question is other than replacing gaskets and seals, is this sufficient to leak out the whole engine oil? Also, how do I diagnose the engine if it has damaged other internals? What should I look for?

I am very worried as I really love this car and couldnt afford much. Not too familiar with engine noise and what they mean but would appreciate it if someone can even point me to online videos for me to hear what a good honda engine sounds like or what sounds should I be paying attention to.