In the FWIW area, flat rate WHEN EVERYTHING WAS NEW AND CAME APART EASILY to replace transmission and clutch was 4 hours.
Three hours is great, but as others have suggested, check the hourly rate - currently $85.~$125. in rural central Missouri.
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