Obviously welding is the safest route. But you have a full frame car of the "perimeter" design, meaning the frame goes out wide, near the rocker panels.
If you don't want to weld it to the frame, have the 1/8" plates bolt to the frame with 4 grade 8 bolts 3/8" or larger ... and weld the roll bar to the plates.
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Ron Sutton Race Technology
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