This book has production numbers in the back, but I don't think they had individual breakdowns of models until 1964ish... it's been awhile since I've opened that book.
Chevrolet Pickups, 1946-1972: How to Identify, Select and Restore Chevrolet Collector Light Trucks (Motorbooks Workshop) (Paperback)
by John Gunnell
# Paperback: 192 pages
# Publisher: Motorbooks; 1st edition (May 1, 1988)
# Language: English
# ISBN-10: 0879382821
# ISBN-13: 978-0879382827
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a list of other great books for old trucks -W 
