In 45 years of Triumphs, the nicest one is the parallel intake ports T140D with Mikuni flat slides I ride now...I also had a 67 TR6 than ran very nicely...It's my opinion a dual carb bike tuned properly and with a rider who know how to roll open the throttle properly, gives up nothing to the single carb bike at normal road speeds and is faster at high speeds..And dual carbs just looks better...

79 T140D, 96 900M Ducati ,61 A10 .On a bike you can out run the demons.."I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"