Tsuppa, my favorite is a pro zinger 15x6(a zinger is about 1.25oz lighter than apc)then the apc 15x6.i dont know which mount your using but i suggest the great planes 60-120 size and mount the engineas far back as possible(picture)this engine will balance good this way, you will have to mount battery and rx all the way back under the wing bolt nuts and you will be somewhere around 5.25-5.5 cgthe firewall also needs new blindnuts , the second pic is where i put them, the dark spots are where i plugged the stock holes,i used 8-32 blind nuts and screws since they are the stock nuts and screws used with this mount on the 60 size.

cant post pics right now, something wrong, will try tomorrow