S14 box is same length as S13, I had to cut the hole in the floor back on my car about 3 inches to get the S14 one in. I used the original gearbox mount, and it bolted up to the original position but needs the holes opening out a little.
What gearbox did you have previously? ie mk1 or mk2?
If its the mk1, cut the dust shield off of the prop and fit in in the gearbox. Then you may have to redrill the floor for the centre bearing bracket. The mk2 props dont have the dust shield on them as this is incorporated on the box.
You might be lucky and find the centre bearing is direct bolt up so you can then just get the rear half shortened.
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