Slant 6 mod's

I am seeing a new Offenhauser manifold with 2 Weber carbs for $650.00, I am not sure about the choke options or kick down link for my automatic trans. Also, I am seeing starter clearance problems for the Dutra Duals, is there a mini starter available? I am confident I could install these parts myself, but I am not sure of my ability to change the cam, since I believe the motor has to be jacked up and the front grill may have to be removed, am I correct?