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Depends on the engine and how rich you intend to run it.. I'd say 250bhp on a YB, 220bhp on a Zetec and 200bhp on a CVH (std engines) as rough approximates.
i got sold 340cc intergrale ones by grove garage for this , but told they will be near thier limits, i had 300cc but he said they'd be on thier limits at 250bhp