Hey Kev, Great job so far, I would recommend some form of treatment for the case, that white powdery stuff will come back to haunt you if you leave it to long. You can use WD- 40 or Moovit , I always spray the whole case for storage ,just remember to clean all the sealing surfaces well before applying your favorite sealant . Double check the lifter bores for wear and the main oil relief piston bore for wear. Make sure that the bore for the distributor drive is clean, and the drive can be installed freely. Good luck on the build, you will do just fine.
Jimmy D