Ali, I can answer the carb question for you. All the 1.6's came with the smaller (1.5) SU's although they aren't really HS4 or 6's. Roadsters all had Hitachi/ISO licensed copies of SU's. They don't share parts, but you can use the aftermarket filters available for the Brit carbs though. From the photos it looks like a pretty original 66. glws