Buick’s public relations department was asleep at the wheel in 1973. Although the brand’s Gran Sport Stage 1 was among the stoutest of the remaining midsize muscle cars offered that year, it was largely ignored by most of the major contemporary car magazines. Car and Driver, Road & Track, Hot Rod, and others failed to publish road tests of the GS, which offered more cubic inches, horsepower and torque than almost anything else coming out of Motown.
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A friend of mine had me stuff a 74 455 from an Electra 225 into his 1975 regal. It is a really nice car and my installation looked factory, lucky to have whole donor car. This was in 2004. It will smoke the tires at 35 mph
A friend of a friend in high school had one back in the early 80's. It was a 455 car and I believe it was a Stage I as well, Blue with gold lettering/side stripe. For some reason, he had it repainted by Earl Scheib, who painted over all the decals and stripes. It was just terrible.