Re: 35 HP Chrysler
Chrysler made two different versions of the 35. I don't pay attention to model numbers so we'll make it easy. Do the spark plugs come straight out of the head toward the back of the engine or do they come out at almost a 90 degree angle toward the side? Each has a slightly different procedure. AND each has a different impeller. If you have not ordered the impeller yet, be sure to be specific as to which model you have.
However, to set your mind at ease, you are only looking at about an hours worth of work--maybe two since you have never done it before.