Hey Bob
You might check you link....I think you have two "http://http://" I decided to try your protractor suggestion but in a slightly different way. I downloaded the pictures to the desktop and then opened them up in a drawing program (adobe illustrator). I then blew each picture up to a large size for accuracy and drew a flat line. I then rotated the line to best match the angle in the picture and illustrator gives you a angle the line has rotated from 0 degrees. I tried to best match the windows rake in each picture. It is a little tricky since the front of the window post has a lower angle than the back so I tried to split the difference. I hope you don't mind that I used your pictures to create a mini picture with the results. Someone might also want to try this on their own to double check results. Of course I had to add the Butcher's ride since I went to great efforts to try and hit 45
I do not know what the original 427 rake was.
It has been my experience that a lot of people think they have a 45 degree rake when they really don't. I found that two things occur when you start getting into the mid to low 40's. The windshield doesn't follow the contour of the body as nicely as the higher rake but the rubber trim still holds a good seal. Secondly, the windshield post "cover plates" fail to function. Here is the piece I am talking about. As you cross under the 50 degree mark, these plates do not have a long enough slot to allow such a high angle and the plates then have to be abandonned or altered. I see that enzo has a second set of plates now that look like they have a longer distance. If you have these plates on your posts and you did not alter them, it is highly unlikely that you window is slanted less than 50 degrees.
and a fun tool to have around the garage is a
digital protractor. Not only good for setting windshield rake, but if you get the type that can be zero'd out one the chassis, you can then use it to set up suspension, even if the garage floor is not level since you are going from the baseline of the chassis.
hope this info was amusing
Andy