Rocker arm recommendations?

Anyone know approximate cost on the B3 rocker offset spacers having trouble with geometry on Promax 171 heads have tried Crane & Harland sharp Rockers ordered a set of Hughes which I use I most builds see how they line up.
Also had to take a heap of the intake side of the head inlet manifold side would not fit I know it fits the factory edelbrock RPM heads also some air gap manifolds same problem on the promax heads but not on the factory Edelbrock RPM's

It all depends on what you need. @B3RE is the man to get in touch with.