I had two (2) GT windshields installed the same day (74.5 and my 70 3.8 V6); the guy who came out to my house didn't have any trouble with either glass, but had to have his boss come out to refit the trim. By the time I got home, both cars were done and looked great (zero distortion and the trim fit was as good as it ever was).
A note to the wise: remove your old trim yourself by slitting the old rubber weatherstrip yourself (X-acto knife or razorblade). It sure beats curling the stainless trim by trying to extract it from the rubber weatherstrip.