Chrysler- none.
Ford- 460 ( Includes Lincoln and Mercury)
GM- Buick 455, Cadillac had 472 and 500, Chevrolet had 454, Oldsmobile had 455, and Pontiac had 455. (Note each division of GM had it's own block casting during this time, the concept of the "corporate" engine was not used by GM yet.)
edit: there were larger American V-8s at the time but only installed in HD trucks, not passenger cars.