Gonna Install New Front Windshield

My son comes in tomorrow from summer school. Smart kid just made an A in Calculus IV.

Before the Fall semester begins, we are going to install a brand new front windshield. We have a new gasket and a new lockstrip. Can anybody with experience installing the front windshield on a 74 Dart Sport give me pointers on what else I need - ie. what kind of windshield sealant, how much to put on, do you put it in the gasket's groove or on the pinch welds around the windshield or both.

The car does have a new vinyl top already installed. Should it be trimmed or just let it overlap into the windshield channel a little? We have no windshield experience.