Try 78spur with a 25 pinion. This will give you an almost identical overall ratio but have the benefit of both giving you plenty of breathing space to mesh and moving the motor further back in the car closer to the diff thus giving more rear grip!!! Win win!! I never ran with the kit spur on my car as I wanted the motor as far back as I could manage whilst maintaining the correct ratio for my motor.
Any questions feel free to ask or pm me!!
Hth
Steve
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