The Comp Cams cam have a lot more lobe lift that standard cams which means with the standard 1.6 rockers you will have a total of .520"/.536" Valve lift (in/ex). Standard L67 heads with #105 valve springs/ Manley retainers will handle a maximum of .545" valve lift before you have trouble with valve stem seals to valve spring retainer clearance. If you were to fit 1.8 rockers you would have .585"/.603" total valve lift which would require different valve springs and the valve guides would need to be machined for clearance to handle the increased valve lift.
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