71-74 left e-body 340-360 exhaust manifolds will not fit an a-body. It is a short necked ball joint
connection style manifold that will not clear the a-body steering column. The right side will fit as
the 623 casting was used for A,B,and E body 340-360 applications. If 340-360 manifolds are being used on a 318 , 318 manifold gaskets must be used
or you will have an exhaust leak as the ports on the manifolds are larger than the 318 head ports.