There are a number of items to consider. The
stock Mazda pump is a convenient package. So, good to go
there. The Kidney shaped ports and the bearing hole for
the pump shaft will be in your new housings. Drillings
to connect to the oil pick up pipe and to the outside
are required. The stock pump will be more than adequate
pressure and volume wise. You can score big on the
pickup shape (trumpet bell) and bolt on end with an "O"
ring feature. I like the pressure relief at the end of
the system (Stock Mazda). With one less rotor spraying
oil there will be extra unused oil returning to the pan.
You might think about that oil returning to the top of a
full engine baffle plate to help reduce foaming.
The deeper the pan and the closer to the
bottom is the end of the pickup, the less likely it is
that the engine can be starved for oil. So, steep climbs
and descents and long slips will be worry free.
You can clock the stationary gears to accept
incoming oil from nearly any location.
Richard Sohn has done all of this and makes
the adapter that puts in 2 cycle oil instead of sump
oil. He also has the balance figured out. Another
problem solved.
The dry sump system is far more complex and
has far more weight and uses a very expensive pump.
Not in the running if I were doing it. If you
need massive amounts of oil flow you can buy the pieces
of a dry sump pump and just build an external pressure
pump and use that on a wet sump engine.
Lynn E. Hanover