[Oldsguy]

The bolt pattern is the same however the actual volume of the exhaust ports in the manifold may be smaller than that of your 350, either in actual dimensional size (width x height) or (width x height x depth). I have a 307 manifold and when compared beside a 455 manifold there is an obvious difference, the 307 is much smaller. As I mentioned, don't know if it will be that evident between 307 and 350 or not. In a pinch, you could use it. Note that your down tube may not mate up to the manifold and may require some modifications.