Wow, old post.
Un-silenced.
Back in the day we put one of these tops on my mom's 65 slant six Barracuda. It fit fine over the stock element. Don't know if the element is the same or not. Made a difference in the way the car sounded though. Wish I still had the top. Went with the car when my sister traded it in on a new 1978 Fiat X1/9.