You could also try Jim Cowles at Shelby Parts and Restorations. He is a Shelby and Cobra expert and has many of the hard to find parts for hipo 289's. He also owns a beautifully restored LeMans Cobra (CSX2138).
His web site is:
www.shelbyparts.com
I plan to have him build the engine for my leafspring Kirkham 289fia. He can build you a correct 5 bolt Hipo 289 right down to the really picky details if that is what you want, or he can build a more budget friendly 289. He has a very good reputation.
Is your 289 almost complete? I would love to see pictures if you have any. There are not a lot of other Kirkham 289fia's around. Mine is supposed to be completed and delivered the first week of September.
Mike