boat marine 120 exhaust intake manifold 1980 4 cylinder

I have a 1980 Renken boat with a 120 Mercruiser 4 cylinder 2.5 engine/motor. I need the large manifold before the exhaust elbow. Mine has an inside leak and its flooding the oil pan. The manifold is pre 1982 with the cover that comes off on the top around the carburater. The other style wont work. Contact me at alldunn71 at american on line dot com or use the ask a question link. Please send pics, price with shipping and a contact number.