Yes, I thought about overfueling too, but wouldn't that show up without a heavy load on it? I can stand on it and it cranks right on on the level without the sputtering, only time it does it is on a grade when being pulled down.........I guess it would be wise to try the 6252 rod(.062 x .052) and see if it cures it, and if it doesn't swap in the bigger jets. Getting to be a pro tearing down the carb \:D

But like they say, 1st your an ameture, second time and expert ;\)

Love Old '67-'72 GM Pickups! Dare to be different.....Running GM Inliners, GMC's MONSTER V-6's, and real inline power, Cummins, in Central PA.