Swapping engines isn't so easy, either. The Kohler AQS engine is different from the engine that is in the 149. The 1250 has a starter and a stator for generating electricity, rather than the Starter/Generator. The Stator and starter are much more efficient. There are no balance gears in the AQS engine, and the oil dipstick.fill tube are standing upright, rather than at an angle. I believe there could be some complications with the pan, as the 1250 utilizes an engine cradle, rather than a solid mount engine. The wiring is much more simple with the electronic regulator, rather than the electro/mechanical style found on the 149. There is a muffler box on the 1250 that wouldn't be found on the older 149 engine and the exhaust would have to be re-routed.
My 2 cents worth is to get that 1250 and use it as is, if the duel hydraulics are functional. Bring it back to stock in as much as possible. Quietlines have their quirks, but I wouldn't run away from them. I rather enjoy mine.
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