Yes, now that we know that it is a Veloce the game has changed. The original presumption was that it was a Normale, hence my posting about the manifold pieces. I suspect that there are few, if any, serviceable used Veloce exhaust manifolds as the pipe was not as thick as the cast manifold. I'm still interested in the combo 750/101 engine as I have one, a Normale, in that configuration.Ken can you post the chassis number of your car, preferably a pic of the data plate & the firewall as well, also the engine number.
Your last post refers to the car as a short body Veloce, in that case you would need the tubular headers that were used on the Veloce's and not the 2 piece cast iron manifolds.
Your car is a '59, lots of stuff happened during '59/'60, including a change to the 101 engine type, but still retaining the 1315 designation for a 750 engine - easily identified as these motors have the side mounted fuel pump below the distributor.