I think the carb in the photo has the air filter adaptor fitted so it looks a bit different to a Fiesta carb. The 38DGAS can suffer with a flat spot from idle to progression when fitted on other engines than the Essex, I ran a couple on Opel engines and the progression drillings in the carb body were causing the problem. One I cured by using the 32/36 progressive linkage and the other by filing the butterflies to change the progression timing. The progressive 38 worked well but lost some low end torque and the other with filed butterflies nearly but not quite solved the problem. I moved to fuel injection so never really solved the flat spot completely on those combinations.
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