My suggestion would be to get the Soarer engine with the auto and then find a UZS131 Crown auto box and use this as this box has a slip yoke output which is compatible with your tailshaft, even though it maybe need to be retubed. Adapting the speen sensors over is easy. Use the bell housing from the Soarer box and bolt this to the Crown box. The Soarer will control the Crown box no problems. UZS131 and UZZ31 have different bell housings. The Crown engine sits on the piss(tilted slightly) so the Crown bell housing(U2 marking) aligns the box back up(axially) so it is not tilted. The Soarer bell housing(U1) keeps everything aligned perfectly. The V8 Torque converters from both V8's are interchangeable but the stall speed maybe slightly different.
You need to use the TC from a 1UZ to match the V8 bell housing length and you must use a V8 box as the input shaft from V8 boxes use a different input spline count to other A34xx style boxes found in 6 cylinder cars.
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