According to my micro fitche a 2-10 is a right hand start using a "bull frog" carb and no decomp .
Strangely enough though a later model ,1972 the super 2-10 A had a decomp ,left hand start and a Walbro SDC carb . Info from the big black dealers book of IPL's .So now it's remains an unsolved mystery as to what that thing is .--the plot thickens --