Hey Chris - Just from the pics you have, the center fill valve cover indicates it's likely '60-'62. The air cleaner is definitely a passenger car unit. But neither of those are definitive as they could have been swapped from another engine, just like this engine found it's way into the AD truck.

Looking forward to future pics and info to try and help with identification. wink


~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)