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If your 72 has A/C you will have to work from inside the the vette. I did mine last year (73 with a/c). There are a few good posts if you search the archives.
I downloaded some photos and instructions that someone posted when they did the job on their early c3 with a/c. It's pretty much the same and I used it to help me do my 73. If you want me to email you a copy just PM me your email address.
Yea: This forum is great as I also was going to rip my dash out but since I have many new projects going as part of my simple engine rebuild it was nice to get one out of the way easier than I planned.