70Firbird,
The second gen. F-body frame rails are basically stamped sheetmetal units- I've had to weld reinforcement plates where the rear sway bar drop links attach to keep the sway bar from ripping them out. They've held up fine since then.You could tie in to the frame rails from up top if you're considering a roll cage- a fuel cell frame would also act as bracing and tie the two rails together.
Geno
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