Hi,
I would find a 356 cam, and I think you have too much carb for the small valve head
(I wonder if the previous owner was building an engine for trials/ trail use?)
I built a bike with with flat top pistons, 650 ally head, 1 1/8in carb and a 356 cam it ran really sweet
It is sooo different to my SR that has high comp, 357, fancy valves and 30mm Mikuni and siamise pipe with
goldie silencer,
John