Yes the kick is fine as you said now,The Hammond and piano really need to be in stereo that's why they were recorded that way.
In mono they are not giving the effect they should have in the track,its mainly mono tracks the cloud the middle and you can make them a tad wider if you wished.
In mono they are not giving the effect they should have in the track,its mainly mono tracks the cloud the middle and you can make them a tad wider if you wished.