Its not too difficult to convert FP to CS (google for the Lyc SB) - as long as the basic engine is capable, from Osxuser's post it seems this one will be. You will have to buy a governor drive adapter, a pipe and a bung or two.
Somewhere on the Lyc website is a description of what all the letters mean. There used to be a description sent out in the kit instruction book - if you don't have one find a builder nearby who has been building for several years.
Pete