Fastback clip can stay on. Remove the interior trim(b pillar, carpet behind seats, etc), black trim pieces that are on back side of sail panels, and remove deck lid, you can then use knives, razors and window removal wire to cut the black urethane glue holding the window in. There are a few threads on the forum about removing. I just did it this winter, to install lexan window and roll bar. Took about 3 or 4 hours to get it out, after the interior trim was all out. Not a fun job, but mostly just patience so you don't break the glass.
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11.425 @115.60
Best 60' 1.543 seconds
3800 S/C 4T65E
New combo : Billet 6262 Precision turbo, PT1001 intercooler, ST1 cam, 130lb springs, comp pushrods, HV3, ARP Rod bolts, otherwise stock L36.
10.263 @ 134.44MPH