ORIGINAL: Red Raider

I have built the Nitroplanes 120 size Corsair (review is pending with RC Report) and aside from the problems noted in most of the other posts in this forum it wasn't too bad. Now I'm building the 120 size Hellcat (also for a RC Report review) and am having a problem with the engine placement. The hole in the firewall is off-center. Is this where the engine is supposed to line up? If so, what is the recommended offset to center the prop in the cowl. There is nothing in the instructions that even addresses this point. Your help would be appreciated and duly noted in the review.