A torque converter, flex plate question, and install question..

Most important thing is to put the converter in the trans and make absolutely sure it's in far enough. When the trans is initially bolted to the engine, the converter should NOT press against the flex plate. You should have to move it forward against the flex, and you should be able to freely turn the converter before it's bolted to the flex

The (most? some? all?) flex and converter are marked, but if you don't see that, be sure that you DO mark them, so that you can line them up. Pre--magnum flexes only align one way