Don't confuse 'leaking' with porosity. ANY FE (original or new) needs the correct assembly procedures and latest gasket and RTV technology and it will NOT leak. I can't speak for porosity issues in the 3 mentioned but have not experienced nor learned of any in original blocks. I had seen where some Dove blocks and heads had
oil porosity issues in the past.
Careful assembly in the rear main cap area, pan, intake and head surfaces assures that both types will not leak.
Barry, Keith, Brent and other specialists can give good advice. I'm tired of the wives tales that all FEs must leak. Those that do ignored the best assembly practices.