Even though the later A-body cars that came factory-equipped with 455s used a special wider mount, you don't need them to put in a 455.
Just use the V8 mounts for your car, they will work for any size Pontiac V8.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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