The info both Kevin and I provided in previous replies above indicates the casting# 3764476 indicates a 1958-62 235.
The casting date code "B 29 8" decodes as:
B = February
29 = 29th day of Feb (must have been a leap year)
8 = 1958 (would have been the first production year using the noted casting#)
Hope this answers your question.

Dan