your answers
i do not have exact sizes but the th350/203 combo is longer than the th350/205 combo so shafts are going to be modifed. the th400 to 205 combo is shorter than the 350/203 combo but longer than the 350/205 combo so to answer your question the cheepest way to fix this is a direct replacement 350 203 my perferance ids the 350/205 combo it takes 21 hp to turn a th350 transmission it takes 47 hp to turn a th400 transmission and a th350 is pleanty strong for almost anything as long as you keep it cool ive run 350s for years and have rarely had any problems
i hope ive helped
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