They don't work. The dakota manifolds that is. I had a 318 in my 65 Cuda. Tried lifting the motor with shims, on one side and on both. Tried grinding on stuff....would NOT work. They hit on the steering box. I could have ground on the manifold to get them to fit, but it would have been ground all the way thru.
I ended up using a set of 75 Dodge Dart manifolds. Worked fine. I had manual steering. Those would REALLY suck on a 408, however.
Maybe grand cherokee manifolds would fit better?
sb