The Shark is a fairly large plane. I had one built from a kit "back in the day" with a Ueda 45. It was Monokoted and finished at 62 oz......I could never get a good stunt run out of the engine. It turned corners beautifully,but I sold the plane when I got involved with R/C stuff. At that time I thought about a larger engine for the Shark ,but never did it. Just my opinion but for today's flying an OS LA 46 might not be "enough"....although the LA 46 is a very fine running engine.
I'm back into "Stunt" and plan on building two Shark 45s this winter.One is an RSM kit,the other an original Jetco kit. I have a baffle pistoned early Enya 60 for one of them and a lite case ST 60 as well. My plan is to use the "heavier" engine in the plane that has a bias for "tail heaviness" and the lighter engine in the one with a bias toward nose heaviness. Both engines run well. Both planes will be Monokoted with target weights around 64oz. Have Fun ,PhillySkip