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Wow, I had those Purple Hornies on my '70 Nova that was running a stout running Big Block. My dad made me shut it off two blocks from the house and coast into the driveway after 10pm, that was every night.. Good Luck!
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Yep, they were a cool set of mufflers. Probably the next best thing to open headers (I didn't realize it "back in the day", but it was a good time growing up in small town Ohio).
Here's a grainy pic of my COPO in it's hot rod days. You can just see the PH's underneath. A BB with PH's was a very melodious combo.