When you used those manifolds, how hard was it to fit the exhaust pipe to the driver's side manifold in the 66 since the 340 manifold is shaped quite a bit different in that particular area as compared to the stock 64-66 manifold?
I'm curious about this too. I've been told they'll fit with a bit of grinding, I've been told they won't fit, & I've been told they'll fit but you can only get 2 1/4" pipe to fit through all of the linkage.