Post a picture up of what you have for the arches.
Some will go for cutting as little away as possible (say 50mm above the Stradale wheel arch moulding) to, as most seem to do, cutting the whole of the side of the rear clam away to the top body line.
Lets see what you've got but for an idea I'd say minimum cut if you've got square arches, the whole side if they are round arches. Also dependent upon whose mouldings you've got.
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