67-69 Camaro, 68-74 Nova lower A arms (same part) They are about 1.75" longer. New tie rod adjuster sleeves are available from the circle track suppliers, they are inexpensive. The uppers for these cars will not work, you will need the adjustable SPC arms.
Impala a arms won't work on a G body, you probably heard about the B body (impala, caprice) Spindle swap, it has 12" rotors and a larger caliper. The B spindle has a slightly different steering arm which causes problems with ackerman and bump steer. Better to go with S10 spindles and Howe balljoints to get the geometry you want.