Any one seen one on a 62 Nova? Prolly not. 400 series. Its a Nova. Not many are. VIN tag says Nova and the Body does also. It was a free-be. They were trashing it. Well, F-that.
While I agree space makes having a rear exhaust a challenging pain in the neck I don't think weight is a factor. The way mine is built maybe three lbs. unsprung weight at most compared to a panhard bar.You don't see the Watt's used that much except for road race/autocross and the Pro-Touring crowd....mostly because it eats up soo much valuable space and weighs quite a bit more than a panhard bar.