Arriving with them was a lively, excessive-tech small-block V-8 (in 221- and 260-cid sizes) that will quickly become a bona fide efficiency mill. Engineers saved engaged on even hotter engines and different beneath-the-desk racing assist, anticipating that prime efficiency would soon be politically right again. But though 1957 was an honest 12 months for Buick, it was even higher for Plymouth, w