removal of a load bearing wall

huangyhg

removal of a load bearing wall
sounds like your header isnt carryng much load except 12'6" worth of ceiling (no attic above?).  therefore, your post loads are not much, but still provide some sort of solid bearing for them.  do not rest your jack studs on 2x6 t&g alone.  minimal solid block between 4x6 beams under the jack studs, then check your 4x6 for the additional load.
it sounds like the bearing wall is parallel to one of the 4x6 floor beams, but not on it. that's sort of wierd.
roger
mech pe...i agree with pylko and add one other comment.  you need to establish provision for uplift in your jack stud connection at the bottom and provide a continuous tensile load path from foundation through roof.  this was likely not done at the time the house was constructed, as codes in 1969 did not sufficiently address this issue for wood framing.