800+HP R5P7 Dodge Race Engine on Craigslist

It's a NASCAR engine and they were being fire saled by the builders when Mopar left the series. I remember Ernie Elliot was selling these things complete for the 4500-8500 range. This is right in that range. At the end it wasn't uncommon to grab one for $4K

Likely in the 355-360ci range.