the deal is not on relation between motor is on mounts and K member with your year... so as far you get right motor mounts to your car and to the engine family, everything should it be fit right.

diff with K member began on 73 and lates B bodies

then also on A bodies at same year or so, BUT just between the mounts kind ( spool or block ), not really engine family, since no A bodies with BB/RB were offered.