From what I can find, you are correct. It's a 413.
Some 413 specs:
Bore& Stroke 4 1/16 X 5 5/16
413 ci
171 hp @ 3,200 rpm
424 ft. lbs. @ 1,200 rpm
8.5 to 1 CR
12 ports
head 9" X 30: 33 studs
Overall length Dampener to trans 48"
Bell housing to timing cove surface 33 3/4"
Pan sump to top of carbs 34"
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