The Grand Ville was the top of the line Bonneville from Pontiac.
Sort of like how the Park Avenue was the top-of-the-line Electra from Buick.
Pontiac also had a 455 as well and was the highest performing 455 out of the trio Pontiac-Buick-Olds.
When I was growing up, we had a 70 Catalina with a high-compression 455 4bbl as well as a 68 Ventura with a 400 that had the tri-power setup from an earlier 421 installed for induction.
One could make great power from a Buick or Olds 455, but it would cost one about 3 times as much as it cost to get it out of the Pontiac Engine.

My family had several Fords/Lincolns with high compression 429's and 460's as well.
We drove them DURING the gas crisis as well.
If it did not have a big-block, my dad was NOT interested.
I drove a 500+ hp 460-powered 1976 Thunderbird all through college.
Got 12mpg and I was happy it got THAT !

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !