Yea you won't have to uprate anything, there are Schrick valve springs but they're Ԛ£75+vat and even Schrick say they're not necessary, personally I'd say they'd only be worth the purchase on a nuts cam like a 288 or higher really.
Haven't heard of changing the cam with the head still on the engine myself, but I imagine it would be more difficult, in my novice experience I'd say an entire Saturday afternoon would remove the head and strip it down to the cam.
2.7 is coming along nicely, everything is going off to the machine shop on Monday or Tuesday, and in that time I'm hoping my 282/272 cam arrives so we can start the building straight away
