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Some more questions:
What brand is the crank? Verify that the stroke is 4.170". A 4.170" crank is generally a 400M crank offset ground. I'm concerned that you received some wrong parts. On such a long stroke, I would imagine that the rod length would need to be longer and the piston compression height would need to be shorter. That may be why you're getting some interference.
For instance, on my 445W, I'm using a 4.100" stroke crank, but the rod length is 6.200". I would think you should be using a 6.200" or a 6.250" rod with a short piston.
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