Differences are
Steering bellcranks
Front shock tower
Front wishbones, caster blocks, steering arms and axles
Transmission and transmission brace
Rear shock tower
Rear uprights, axles and driveshafts
Shocks
Wheels and tyres
To update a Classic for racing I would suggest a Stealth transmission, ballraced steering bellcranks and longer front wishbones will make the biggest performance differences. But the stealth transmission kit is half the price of a Worlds buggy on its own.
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