What did the car start out as originally? Do you have a picture of the fender tag by chance?

I hope you are reinforcing the hell out of it with the 505. Our '66 convertible is like a wet noodle with a warm 440.

I can give you some tips on the stereo system if you want to hide it. Also, if you guys need any parts we parted a '66 Belvedere II and save everything we could due to scarcity.