Ok Cool. I wish you the best of luck. doing your own build is quite fun but can also be challenging. if you are Mechanically inclined and you are getting into engine rebuilding the L20B is a good engine to start with as the datsun L series are easy to work on and pretty straight forward. watch videos on youtube as there are many and very detail and easy to follow i personally have not made any videos as i am not good at doing them but there are really good channels to follow
Cars, Bikes, and Coffee on youtube has lots of info on the L28 and sutch. the datsun Z engines are built in the same way as an L16,L18 and the L20B to name a few