i cant see a problem with the set up as in the anglia at all and it looks fantastic

only thing i have heard is that if you use the mk3 fiesta module thing the car doesnt run perfectly on part throttle but full throttle is excellent on them

if space is an issue the only way i can see twin 40/45s fitting is if you use a very short trumpet, but this will loose torque, and wouldnt be a good idea at all, unless you cut the inner wing for the airfilter to sit in or didnt use an air filter (not sure if you mean the carbs wont fit or carbs and airfilter wont fit!?) but again thats not advisable in a road car