'65 cuda 273 car info neeeded
64 was the last year for the pushbutton shifters.
65 was unique as it still had the cable shift trans and a "regular" type shifter.
The heads with the unique bolts were the 64 & 65's.
66 was the first year of the "newer" style bolt pattern/angle for the intakes and the linkage shift transmissions.
If you want to use the "standard" type intakes, you can just interchange the heads with 66 and later 273/318 heads and then go with the "standard" intakes available if you are not going for a period correct resto.