You;re hearing and reading too much , the 350 had no scythe attachment , besides which they had fairly awful gearboxes , and the clutch was even worse , given the ammount of work you intend to give it , it would have you spending mega pounds and hours of repair.
Have you considered a Merry Tiller Titan with scythe attachment , a much more versatile piece of kit , very reliable and spares easily available.
Andy.