The Corsair is a "hot" airframe to begin with that has a stiff wing loading (24 oz/in). You can use the .90, but the added weight up front and balancing weight needed in the tail, plus the added weight of fiberglass covering combined with the landing gear designed for a .40 means when you come in hot from the added wing loading you'll likely collapse the gear. Try to slow it down and you'll stall. When the conditions allow you to bleed off speed and flair her in you'll be OK. Eventually the condiitions will not be OK (no headwind). How are your skills at landing at 55 mph and is your air strip long enough for a 200 foot rollout?