Speedtech 64-72 Chevelle Chicane Coilover - Manual (Page 9)

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10. On some frames, depending on shock and spring combination, it may be
necessary to clearance the inner section of the control arm mount as seen in the
photo below. Do not do this with the shock installed.
11. Remove the shock assembly and then remove the spring from the shock.
Reinstall the shock into the lower control arm and the Chicane bracket to test
again for any binding throughout the control arm's range of motion. Now that you
have double checked everything and there is no bind and no clearance issues,
you can final weld the Chicane upper bracket in place.
12. Once all welding is completed you can paint and/or reassemble all
suspension components.