had what i thought was a bad manifold gasket went to the boat store ,bought me one n tore her down,now when i got the manifold off i noticed that the little pipe thats in the middle or so exaust port was completely cracked in half ,this little pipe is for my choke,runs top to bottom,and its causing a good little exaust leak out the bottom of my manifold. the motor is a 84 omc 3.0. i was wondering if anybodys ran on to this before , is there a quick fix i can do , a replacement part , or a new manifold? appreciate it.