Yes 68 was the only year for them. 67 was different, just fins, and 69 had a whole different hood. I have pictures of the 383 ones that are in a little better shape.
I also added a vent and intake to the garage/basement when we replaced our old system years ago. Great move for all the reasons you mentioned plus I can work down there all year round.
Not only is it expensive, will the work be done right. Paint is easy compared to welding quarters on. Nothing better than a solid car that all you have to do is paint, and bolt on your suspension and drive train.