Sorry I didn't have time to read everything on your engine... Did you ever think of getting some offset keys for the timing belt? That way you could correct the cam timing and they're usually quite cheap. In the past I've machined offset keys for "cheater" race engines where an adjustment in cam timing was verboten in the rules. By undersizing the key itself you can sometimes use that to offset the pulley and re-tighten it in the offset location. Since the key is still there if it does slip you're still protected against hitting a valve on an interference engine. Just a thought.
-Michael
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