On your V5c what emission limits are stated? Mine has nothing so I think should be just a visible smoke test. Sometimes my mot place take a reading and tell me off as it’s too lean, but on my sheet it says the limit is 4.5 for CO. Not 3.5 I’ve got R1 carbs, mains are 1.7 but not sure on the idles, I should put bigger ones in.
its a pinto btw.