I am looking at acquiring a 308 GTB that has been converted to 288 GTO specs by Jim Carpenter and Engine work by Bob Norwood. The modification is extensive, including the right engine orientation (longitudinal vs transverse), twin turbo, etc. It has very low miles and the conversion is professional grade (not your normal kit car). Does anyone have a sense of the value, or know of comparable cars that have been sold. This will help in me in my (hedonistic) decision. Thx for suggestions.