I've been using an exhaust manifold off a 1968 Chevelle. The ports on it are under the spark plugs so that makes changing them easier because you can see them and also makes for easier wire routing. The exhaust has a bend inward toward the motor right about where the stock steering box is located" so that free's up some room. The part # is GM 336710 LH

My stock 67 RS Camaro also has this type of exhaust manifold.


Joe