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a 366 is a raised big block truck engine It has very small valves and tiny pistons and cannot be bored to 427 or 396 it is a hi torque low rpm slug and belongs back in that schoolbus, but may have a steel crank
 

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First the steel crank is the same as a 396/427 it will have a wide parting line where the journal centers are lenthwise if its cast the mold line will be thin and have the letters NF cast into the crank second a hi block or tall block has about 3/8 taller deck height than a car block the intake manifold is wider the reason is the pistons were 4 ring design
 
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