Hi everyone! I just realized my 67 427 is NOT a Z-24 . it was built in Atlanta I believe. I made friends with the original owner before he passed. he sent me the original car invoice. the car was ordered on 12-21-66. it does NOT have a 4D on the cowl tag. the car came with the Z-24 package. on the invoice it lists the 385 HP engine-316.00 then at the bottom it lists SS 427 Package 84.30, so maybe the two of them in combo,worked out the Z-24.