Alan, when I bought my old Unique Cobra, it too had the MGB front suspension setup and one of the first things I did was to swap it out for a complete coilover double A-arm assembly from Unique. It is a complete assembly including the crossmember and came with Wilwood brakes, adjustable shocks and a new steering rack and was a simple bolt on job with the exception of the supplied shock towers which had to be welded to the frame. The difference in ride, steering, handling and braking was night and day, plus I think the new assembly is a lot lighter than the old setup. There is an Arntz/Butler owner here who looked into the possibility of fitting Unique's front suspension to his car but I don't remember what the outcome was. Check out the guys on the Unique forum
http://www.uniquecobra.com/default.asp .
A couple of them have upgraded their old MGB units with A-arm / coilover components from Hawk. Do a search over there or post a question for the details.