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Willy (JC5) box is the stronger but 5th gear has a higher ratio. Given that the 16v doesnt have as much torque as a willy this MIGHT mean that once you hit 5th your acceleration will be very poor (in comparision to a std 16v).
All depends really - if your going for more power (i.e seriously more like TBs/Turbo etc) then get the willy box, otherwise theres not much point (IMO).
Yeah, the Willys 5th cog is very tall. I can barely get a ton out of 4th, so to take the car right to the book figure of 134mph, it must be a REALLY tall 5th cog!