Doesn't sound like an RS1600i cylinder head mate. I'm pretty sure the RS head has round ports and H81SM-6090-BRA is the number for a XR3i head. The head number for the RS1600i is H81SM-6090-AA.

BP285 is definately a piper cam though,- you can find the spec for it here: http://www.motorsportworld.co.uk/fra...-BL&PID=318166

To be honest it sounds like a tuned XR3i lump and an XR3i loom, - nothing wrong with that. If it was a genuine RS1600i cylinder head it would be a real result because they're very hard to find.