Go to safelite.com . They'll give you an "instant quote" according to your location.

I didn't find one for a '85 but I did find a quote for a '81 (should be the same) for $213.00 + tax, the labor was included.

You have an option, either supply your own gasket (recommended) and if it leaks, it's your problem or have them use their gasket and THEY own the problem.

I was very pleased with the last windshield they installed for my '73 280. They use Pilkington glass. Their gasket they installed split about a year later on the lower corner and they replaced it free of charge.

Be aware! The sealing edges around the windshield moldings are prone to rust! If they'll agree to it, have them remove the windshield then YOU inspect and clean the area or you could remove the windshield yourself and prep the edges. It's your left shoe which will be wet not theirs.