I have a 1966 Ford 3000 (gas) (built in UK) with its original Holley carburetor and approximately 1700 hours of operation time. This past summer it began stalling when the right front corner of the tractor is lower than the rest of the tractor. It starts and runs fine all other times. I have read some comments indicating that Holley carbs were a problem and recommending replacement with a new Zenith carb. I would appreciate any thoughts regarding the stalling problem, and if you believe the carb is the issue, your thoughts regarding a fix (ie replacment with a Zenith vs. rebuild). Your consideration is appreciated.