YEAH! You could run the exhaust out of the hood like the cars on Mad Max. That is AWSOME!
Actually, I know Oldsguy ended up putting true duals on his 69 Delta 88 that he had. We found a driver's side manifold from a Toronado and cut the rear dump off of it. Then we turned the dump around so the manifold dumped up instead of down and had it welded back together. Then we had the passenger side manifold welded up instead of putting a cap on it. MUCH BETTER and looks better too! Once the project was done an exhaust shop ran duas from each side of the engine all the way back. If you purchase a manifold from Thornton I believe they will allow you to run duals without doing any modifications. The manifolds are made to clear the steering gear box which sits farther back than in later cars.