[Mr70]

Just to add:
Air Condition Equipped Cars also used the #3947772 7 blade Fan too,as well as ALL w/Solid lifter engine for those years..I have never seen a #772 Fan w/o a Date or part# on it.
The 1970 L-78 Chevelle received the #772 7 blade fan.
The 1970 LS-6 Chevelle received the #3976064 7 blade fan,(no date or part# on it),but some Very early built ones got the #772 7 blade fan also.