[C10 - C90 Bill]

I checked at 3 different places and all 3 are saying a '65 283.

We also cannot tell by the Side Emblems, as someone has taken them off.

Also, the Steering Wheel is not a '66 and is a '65 and earlier style.

The proof will be in your VIN though.

If you post the first part of it, we will be able to decode the Year of it for sure.