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Twin cams are permitted as the head is ‘original material’, it’s only when you want to replace a cast iron head with an ally head that’s not permitted. So a twin cam would be eligible, in an Elan, Europa, Cortina Mk1 or Mk2 or an Escort. Seeing as you can change the block for a 711m block (same family), I would think an Escort twin cam would be very competitive with wide slicks.
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