As for grose ball style for the NH carbs in several T's they had fuel delivery problems. Changed with the good old needle and seat and puuurs like a kitten.
Van this new gas today gives us all headaches no matter the make or model, send it out and have Charlie go through it and she will be fine
John is right on with crap and floaters in the system giving you trouble. I just love the new larger poly tank I put in my 39, keep the stabilizer in the fuel as well.