If it's still ridable, consider using a carburetor cleaner in the fuel tank. It may do some good, sometimes it does. Techron is a good one, a lot of folks swear by Seafoam.
It's odd that it would run fine at first and then not, unless the gas tank is rusty and sending rust particles into your carbs?
Princeton is a little higher in elevation, VM carbs don't compensate for elevation at all. 2,000 ft should not matter much, but if he had it on the rich side it could. Try opening the air screws just a little bit. It may help it idle better.
Not sure about the spewing gas thing. You could add an inline filter just to see if it's getting stuff in it from the tank.
It's odd that it would run fine at first and then not, unless the gas tank is rusty and sending rust particles into your carbs?
Princeton is a little higher in elevation, VM carbs don't compensate for elevation at all. 2,000 ft should not matter much, but if he had it on the rich side it could. Try opening the air screws just a little bit. It may help it idle better.
Not sure about the spewing gas thing. You could add an inline filter just to see if it's getting stuff in it from the tank.