On the Phase 2 engines I would recommend changing the cambelt tensioner, as the plunger has a habit of going soft once it's been compressed to remove/refit. You have to make sure it get's compressed in alignment otherwise the seal gets damaged and it fails soon after. You then get knocking as the tensioner bounces on it's end-stops.
I believe two cams also freely rotate once the belt is off which can cause shims to move (what I was told not experienced).
Personally this is one job I would give to an expert, and rely on their skill and 'warranty' should anything go wrong.
I had a nasty (and expensive) experience on my 3-door Cosworth, and that only had 2 cam's to worry about.
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