your Le Sabre should have a 340ci in it, which is a SBB ( small block Buick ).
the 455 is obviously a BBB, and those didn't exist in 1966.
however, that version of the B-body ( what GM called the cross platform chassis that the Le Sabre was built on ) seems to have run from 1965-70, and the Le Sabre did come equipped with a BBB in 1970. so that's where i'd look.
https://en.wikipedia.org/wiki/Buick_...2.80.931970.29
you can give www.TAPerformance.com a call, and they can probably tell you exactly what you need.
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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