spasmatic: Thanks for the info. Did you happen to do any reinforcement as NM2K suggested in the post after yours other than the firewall area?

NM2K: Thanks for the info. as well. I didn't think about the wing attach areas or tail area. The FK can take up to a 90 size engine as speced/built according to BTE. The gas engine that I am considering and that spasmatic is currently installing has about the same power output, but with a weight gain of course. With this in mind, do you think it is still necessary to do the additional reinforcement other than the firewall area? Mine is already built and is "simply" a conversion, so reinforcement may not be that easy.