number is 7043240LA0203 I think it breaks down as follows 70=quad 43=73 2=49(quad 4bbl federal standards) 4=Buick 0=Auto and should interchange with the 72 which is an automatic 455 4bbl correct me if I am wrong kinda new to this world TIA
You will also find that the '72 carb is a little richer, which will assist in both power and mileage. I have, on too many occasions, seen emissions go DOWN and mileage go up by slightly enriching the mixtures. It is because the richer mixtures allow better throttle response, and less required throttle settings for the same performance. Ray
