Ok, you made me go digging. I hoarded these coils up over the years. These are both from 71 Small blocks, the one dated 330 is from an early 71 340, the other might be from a 318, I'm not sure. They are identical in every aspect except the date codes (which are also pretty close). One of the brackets had a gold finish and one has a bracket with a silver finish, these have never been apart and enough original plating is visible to confirm both as genuine.