According to his spec number, he has no "SmartSpark" at all.
According to his last few posts, who can tell?
But I can tell anyone here that you cannot interchange just part of these parts, it has to be one system or the other.
To the O.P., what is the model number of your tractor, off of the tag under/behind the seat????????
The Original Tractor came with a 17 HP Kohler Single Cylinder Engine - Sears LT2000 Model #917.273140 - the original engine blew so it was replaced with a 20 HP Kohler V-Twin Engine by original owner. The NEW Engine was put on the tractor it is a KOHLER V-TWIN 20 HP - Model # CV624S - Spec # 65578.