I did it like this on my 69 GTO. I loosened and removed the bolts on the mounts between the wheels. Loosen only one side at a time! I think in my case that was only 2 with bolts in them. I then placed a piece of 4X4 on my floor jack and placed it under the floor pan. I wanted to spread the load as widely as possible on the pan. Then I lifted. Only enough to get the old ones out and the new ones in. Nasty job, but no big deal. Seems like I also had a couple that simply supported the body, with no bolts that I removed and replaced at that time. One was inboard of the frame turn in behind the front wheels and another was in the area where the frame arched up in the rear axle area.
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core.
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