the 2.3 and 2.5 are different carbs. i had a 2.5 carb on my 2.3 , you can tell the difference because the 2.5's weber dmtl has two solenoids , the 2.3 only has one.
hmm that interesting coz the 2.25 carb is from the engine yu gave me - and its got two sillynoids!