a Skylark could be equipped with a v6 in 1967.
however, i also think that Buick was following the Chevrolet VIN convention in those years and an even number model code should denote a base v8 car.
most of your v6 Skylarks will start with 443 ( a 'California GS' was a base v6 optioned to the four barrel 340ci ).
the BBB 400ci was only available in the Gran Sport that year.
so your car, being a 444, should have either a two barrel 300ci or one of the 340ci engines.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)