Started working on the pop out windows yesterday. I' using the Detroit Muscle Tech. installation kit. I'm not happy with the drivers side install. the lower gasket is gapping from the body quite a lot in the rear. I'm going to work on the passenger side today and come back to the left later.
Saw you fixed the gap problem. I had that too and had to jam some foam strips in between the lower rubber and window frame. Then when pushed the window in it had no gaps. Learned on the fly like you probably did also. Your car is beautiful.