Help with exhaust manifolds for a 66 cuda

340 manifolds rock. Dakotas cut to fit are even better (ask Richard Ehrenberg) 273 manifolds into a dual system work well too. Headers for these cars suck for cruisers unless you get TTI's or Dougs. They are the only headers that FIT. 300HP is well within the flow of manifolds, but 300 from a 273 will be a cranky, lopey motor. I say try the Daks (early ones with the larger dump) and let us know the results.