The Zenith is a fine carburetor, but this one is a wee bit large for your 261. Bore the 261 125 thousands, and stroke it a quarter of an inch and then this carb would be fairly close.
Jon.
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
