Given the weight of a 66 Impala and the spacious engine bay I'd go for a big block Chevy. You need torque for heavy car. A mildly built 454 can esily make 400 ft lbs of torque without winding up the RPM. Put a 700R4 behind it and the overdrive will help on the highway. Personal choice but I wouldn't run a small block in a car that heavy. Torque at low RPM is king. With aluminum heads and intake and headers it will weigh less than an all iron small block.
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