Not sure on what gearbox you are looking at using but the rwd 3s bellhousings that are suitable are the ones behind a 2s, 3y, 4y, 1c motor.
If you are looking at cutting the bellhousing as it seems you are and grafting on whatever transmission you have then wouldn't it be easier to just cut the fwd one? Surely it would be easier to find in Greece anyway? Just buy a old stuffed fwd box and cut that.
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