which motor for this plane?

[lakeside1000]

Hi all, I am trying to help a friend who need a new motor for his plane, its a foam glider 40 inch span, with the motor mounted in a pod as a pusher above the wing, it had a small brushed motor with a 5x5 cheap plastic prop, prop clearence is a problem, it might just take a 6 inch prop, we are changing the motor , esc and battery , the motor is really only used to get hieght , then off or slow run to soar. all up wieght is about 450 grams ,any suggestions please, im new to electric flight so struggling a bit for ideas, thanks for your time, regards alan in spain. ps, anything from hobbykings lists will be ideal .