The 327/300 was a great engine. It was under rated and probably produced probably closer to 325 HP as measured at the time. It was also not cammed up so much as were the higher HP engines and suitable for use with automatic transmissions, power brakes, AC, etc., as a result. No higher HP 327 engines were offered with automatics.
IIRC, the 327/300 was last offered in the Impala in 64. It was replaced with the 327/275, which was similar but with a Rochester quadrajet. I believe it was nearly identical otherwise.
I had a 64 Impala SS hardtop 327/300 4 speed the same palomar red metalic with black interior as the pictured 66. I also had a 64 Impala SS convertible 327/250 powerglide. These were completely different engines. The 300 had 10:1 CR, bigger ports with 1.94 intake valves, forged crank and pistons and a Carter AFB on a cast iron semi hi-rise manifold. It also had bigger exhaust manifolds with 2.5" exhausts. The 250 was an 8.5:1 CR regular fuel engine with cast crank and pistons, 283 heads, Rochester carburetor and smaller exhaust manifolds with 2.25" exhausts.
62-64 Impalas with the 327/300 and 4 speed transmission, if not too heavily burdened with options, would shut down most of the similarly equipped tri power GTOs of the era. I never lost to one.
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