K301 would fit in a narrow frame with no mods. Either you have the wrong blower housing/flywheel on it, or you put in a K321 (or even a K341). I'm sure it did bend the frame. Can't just go hacking up a frame and expect it to still have strength. As far as the rod knock..... You sure it's a rod and not the PTO?
Wide frame and narrow frame tractors don't mix. Can't swap parts and pieces with a 129.
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