Fitted PCV and no more fume smells in cabin, also rocker cover has stopped leaking now some vacuum in there.
I also seemed to have improved my fuel mixture settings. Before, if I set up carbs to give some brown (along with sooty)colour plugs for city driving they would be very white on a run and car seemed to lack power. Now I have at least a grey colour after a 15 mile run up the motorway at 3000 revs and car seemed to pull well, so will live with that and hope its not running a bit weak.
Could this be related to how it's breathing now with valve fitted please?.