The burton kit shown is a little upgrade to the std block and cam cover fitting scenario, in that is has an adaptor to return the oil on the exhaust side to below the oil fill line so it isn’t blown back up into the breather.

best way is to breath from both sides of the block, use the ally piece for the cam cover to make block adaptor the right pipe size, I araldited mine as a sleeve over it.
them you need to find approrpriate fitting to have oil return going back into the sump, can be to sump plug location.

there are loads of historical threads on this if you search back a few years.