which gas engine do i need
<span style="font-family: Comic Sans MS">hey everyone. i'm getting ready to build an anderson kingfisher airplane that has a 108" wingspan, 49" fuselage, and weighs in at about 16 1/4 lbs ready to fly, according to the plans. it also calls for a .90 2-stroke or 1.20 4-stroke. i'm looking to use a gasser instead of nitro, and was wondering, if i have enough space for the gasser, what size CC engine should i go with, if they even make them that size. i don't want it grossly over-powered, though.i've never built anything this big before and really know nothing of gassers yet. any help would be appreciated.</span>