a couple of thousand miles a year or twenty thousand?
It wouldn't hurt to take the head off and see what seats its got and whether they've got any recession already.
If you do it yourself it'll only cost the price of a gasket or so.
My recollection is that no-one said they were bad engines, just that Rebello were a little optimistic with the quoted HP. Bearing in mind this is the engine that Rebello sell as 365 HP, seems justified.