You have a Balsa USA Stick 40 (with those barn door ailerons the wing has been modified or is from another plane). The design originated in 1973 as the Kwik-Stick series (I was .15, II was .049, III was .60 & IV was .35 powered) by George Chabot (RCM plans# 543a for I & III, and 543b for II & IV). The Kwik-Stick was designed to use what ever spare wing you happened to have on hand.

I've had several Swizzle Stick 40's (predecessor to the Stick 40 with the traditional stick tail) powered by anything from a K&B 3.5cc (.21) to an OS .30 FP and K&B Torpedo 40. I also have a Stick 30 framed up ready to cover. All the sticks I've had are very good flyers, and if kept light enough will readily thermal (I've had flights up to 2 hours).

Power wise you .46 LA is more than enough power for the Stick 40. I'd recommend keeping with your LA on it since you already have it and put a good .46 or .55 on the GP Cherokee or what ever you get for your next plane.

Hogflyer