Leaky windshelid on a 67 cuda

Have a cuda that has always been in a garage (though its a little beat up, for a seattle car its not to bad), took it out yesterday in the rain, and noticed this morning there was some water on the floorboards of the driver and passenger sides. Any tips on sealing an existing windsheild gaskett, or is the solution to get a new gaskett and redo it?

JB