Even a base model full size Buick wagon had a V-8 powerplant in the 70s. 1977 Buick "Estate" wagon, the base "LeSabre" version of the wagon lineup. No woodgrain applique for these babies, or hood ornament, for that matter.
Before the minivan was a twinkle in Lee Iacocca's eye, the Buick Estate Wagon was among the vehicles of choice for affluent families. This example, a 1975 or '76, aptly shows just how big these vehicles had become. By some accounts, these were the largest and heaviest wagons ever built, giving their 455 cu. in. V-8 engines something to work against.