This was provided by Don Antilla Take a look.

There has been much discussion here in the past on this engine. It definitely showed up in Ford advertising but there were questions if they ever built or sold any. I just got a very nice reprint of the Ford Technical letters on the 300 Horsepower Supercharged 312. There is a lot of interesting technical and historical info in this. One thing that stuck out to me was several references to the 285 Horsepower engine. The plan was to discontinue the 270 and 285 Horsepower engines when the supply of 300 Horsepower engines caught up with the demand. It all ended with the AMA racing ban. All those references lead me to believe that the 285 Horsepower engine was out there. The conclusion from previous discussions here seemed to be that none of the 285 Horsepower engines have ever been actually documented. Anyone else gone over this info and have an opinion?