early A body engine swap

When you get the motor out, post a pic of your steering center link and maybe we can tell you if it's a V8 center link. A lot of 66 A bodies got V8 center links even if they were factory 6 cylinder cars. Even if it isn't a V8 center link in the 66, the one in the Valiant will swap over if it was a factory V 8 car.