I've got a tune port system on my 355 in my 71.. If I had a good carb intake / carb I would throw the tpi in the dumsta.. It does always start good though, I just hate it. Can't find anyone to tune it anymore.
Only a couple places where I live capable of tuning one to make it run like a top, by the same token Rochester carburetors work extremely well when you have some one that can tune them also............