I wondered "What's a Plymouth Breeze?" So I put it into Google. There are groups, forums devoted to it. And there are some reviews of that '97 here:
http://www.carsurvey.org/modelyear_Plymouth_Breeze_1997.html
If it's overhead cam, it doesn't have pushrods. Some cars, whether pushrod or overhead cam, will run the valves into the pistons when they go out of time; others won't. It's more likely with high compression engines.
A blown head gasket does not necessarily guarantee there's another problem, but it's sure something to check out.
It's worth asking a Mechanic for an estimate. Heck, your local dealership should have a quote, right out of their Flat Rate book.
An independent shop will usually beat a dealership on price. The dealership has the inside track on parts and specialized tools.
Ask around. Good Luck.