With your
oil pressure going to zero I would assume that you are pumping the
oil pan dry for a second and need restrictors. Getting a lot of
oil in the top of the head and getting over the seals some and causing the smoking. It may be the intake gasket some but when an intake gasket leaks it usually gets into all of the cylinders but with yours having individual runners it very well could be the intake gasket on that one side. Check the match and angle before you bolt it down again and make sure the intake bolt holes are opened up enough where the intake does not bind in any way on the bolts as you tighten iy down. Just some ideals to check.
Good luck, Keith