According to Bob Mannels "Mustang & Ford Small Block V-8" book, there should be a date code stamped in the air cleaner base plate (5A = Jan '65) and that the HiPo air cleaner for '66 was unchanged from the '65 design. Your picture looks like the correct air cleaner (maybe a repop with no date code?). Pictures in this book appear to have a painted (not chrome) base
The 66 C5ZZ-9600-N air cleaner was a chrome top and Ford Corporate Blue base, and there was a connection for the crankcase breather in the base. Yours however, appears to be the cheap copy, not an original or good repro. A larger photo will help.
The 64-64 C5ZZ-9600-N had a gold base, and may or may not have the base connector. The chrome lid on the earlier version 64, early 65, had a very different "double ring" design.
Amateur restorer. Well, sometimes I have been paid for it. But not right now.
All of my hi-po tops look like 22GT's car. I have a flatter on from my 65 K GT FB, but it's also quite heavy, as compared to the repros that are very light. There's no marks, but it does look like the later chrome top.
64 9/10 Convertible- 374,000 miles & counting (2nd owner)
65 GT Convertible
65 K GT Fastback- 59,000 original miles
69 GT Convertible- 75,000 miles
08 P-71 Police Intercepter
200 F-250 Lariat, 2010 F-250 King Ranch
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