Before trying to fit a 6 speed you need to work out what the overall ratios are - 6th might not be a higher ratio, it could just mean that there are 6 gears spread over the same range as the original 5.
We had a long debate about this in a classic club where some members were complaining that third in the 3 speed box wasn't high enough and they were going to work out how to fit the 4 speed from a later model but didn't understand that on both boxes top was straight though and what they needed to do was find a taller diff, so you need to be sure that the overall ratio including the diff and tyres is a higher ratio (unless the reason is to have a close ratio box for optimum use of the revs.
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