Chin spoiler 67-69 cuda

Take a look at one from a '68 or '69 Camaro. The '68's are a little longer (bigger spoiler, not wider), the '69's are a little lower profile. The B body guys seem to use them with pretty good success, I bet you could make it work for a A body 'Cuda. Nice thing is they're available in fiberglass or plastic from pretty much anywhere, and they're usually pretty cheap.

Here's a thread on the Camaro spoilers on 2nd gen Chargers...
http://www.dodgecharger.com/forum/index.php/topic,69474.0.html