'66 Riv Motor & trans?

Can anyone tell me what the standard motor and trans. for a '66 Riv was?
401 nailhead? 400 TH? Thanks in advance? Norm

 

Most likely a 425 with a ST400 trans


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1966 45,348 (Includes 5,718 GS Option) Standard: Wildcat 465 425 cu. in. V8
Option: Super Wildcat 425 cu. in. V8
Note:The SUPER WILDCAT option (dual 4bbl) was a dealer option until 3/66.
The engine code MZ was stamped on the engine block only after 3/66.