small carter carb..

I will warn those who have not really worked on the oem poly 318 set ups, that the bore spacing is NARROWER on oem carbs than all other AFB carbs. SO beware on interchange.
Airhorn has nothing to do with it.

Sorry but you are a little off base and yes I have had several poly engines in both single and dual quad. I only mentioned the air horn in relation to choice of air cleaners. (I made that clear) The AFB carbs sold today have the standard and narrow pattern. I gasket matched the intake on my 354 Hemi in just the same way I described and the newer carb bolts onto the 50s era manifold NO PROBLEM. Do plan on spending a bit of time with a carbide burr though. If you do end up with the early small throat carb the single snorkel air cleaners from the later model larger two barrel engines (360-400) will fit.