The pillarless Impala Sport Coupe light out of the lineup, so a formal-profiled Custom Coupe was the one Impala two-door. True pillarless hardtop coupes remained, together with the Impala Sport Coupe that continued the roofline launched in 1973 -- reasonably paying homage to the original 'sixty six Caprice's roof therapy. Dramatic new Custom Coupe rooflines continued the "Colonnade" styling that debuted...