Also note, there are two different timing marks on those gears. One is a diamond, one is a triangle. Make sure the marks match between the gear and the back cover.
My 97 also broke, while driving. The only damage from mine was self induced by not getting those marks correct. ... for 20,000 miles. I had gotten the cam correct, but the lower one where the cam used to be in these engines I had lined up incorrectly, and this is where it senses the camshaft position from. It ran worse and worse and worse until finally f you gave it too much gas on the highway it felt like the engine was trying to escape out from under the hood. I knew it wasn't running right, and re did it like 5 times until on a help post someone pointed out those different marks.