I had the extreme pleasure of viewing this engine a couple of days ago when I met it's owner. He informed me that GM produced just a few of these small block 350's in the late 60's for marine use. This particular engine is obviously slightly modified. The intake is an opposing dual carb set up using Carter side draft carbs from the early corvettes. He also adapted the cam driven distributor from a '48 Ford flat head. It will soon find it's home in a 1940 Chevy pick up rat rod which also has many impressive modifications. Super cool for sure.