I believe this is the engine that was put in it in 1970. Why? Noone knows as original owner passed about 25 years ago. It has a HM suffix code.
The 1964 Chevrolet L76, 327 cubic inch displacement (CID), 365 horsepower (HP) engine was the most powerful production standard small-block V8 built until the Chevy LS6 came out in 2001.
The Chevrolet L76 327 CID top end carbureted V8 engine produced 365 HP at 3,200 RPM. Its bore and stroke is 4 inches by 3.25 inches with a torque rating of 350 foot-pounds at 4,000 rpm. The compression ratio is 11:1 with a compression rating of 140 pounds per square inch.
Production of the Chevrolet small-block (small for a V8) engines began in 1955. They were known as "Mighty Mouse" motors for their high-performance ratings. The 327 CID, 365 HP, L76 small-blocks were built from 1964 to 1965
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