I have a 3.75 hp Yard machine by MTD mower that I need a carb for.
I looked and there is a sticker that has an engine moder of LEV100 340003C, but I can't reference that to anything.

Do you have any small engine shops around you? Sounds like you have a tecumseh. The model numbers are important to get the right one.

Ok so I looked at this thing again. It says engine model is LEV100 340003c engine family is WTPXS.1631BA.
I also found some numbers on it looks like the intake that say 51-0-152 36.
Any information would be helpful. The grass and weeds are getting tall..

This is a Tecumseh engine also.

Like I said, see if any small engine shops are around you, they should be able to hook you up with one.