Cool :-)
Here is how I found mine - I kept searching for boats with a BB Mopar in it. I found one that the guy was selling separate, so I bought the engine for $300. It had the logs, risers, valve covers, and a bunch of other parts (even a custom made baffled 8 qt oil pan and pickup). Unfortunately the mounts were for 23" wide stringers (keep that in mind if you need mounts), mine were 26 inches.
Anyway I have some parts you may need that were left over.... exhaust logs not in that list unfortunately.