From what I found, this appears to be a cast iron intake manifold for
Chrysler marine engines
INTAKE MANIFOLDS
LM318, M340 & M360
2846347 and 2846707
Used 1968 to 1974 - Raw Water Cooled Engines with Two Impeller Raw Water Pump & Carter 4 BBL Carburetor.
hi and thanks for the replys.manifold has big rake for carb base and that is what thru me off.it might look good with a carb on it.it did not come with one.thanks once more,mark