I have put a 1750 engine in my 67 Duetto (temporally lol). Runs great. There were some bugs that had to be worked out to make it work - new water pump and radiator hoses and custom exhaust come to mind. So heater hoses out/in don't line up with the holes in the body, and for those that know , it dosent look original. I have been thinking about the possibility of putting the original intake manifold on on the 1750. Will this work , with out down grading performance ?. Both engines are Euro spec with Webber carbs.