Kevin,
Here is one of the threads I was remembering. It came up several times over the years.
Ford Modulars are enormous engines
I thought it had the 460 engine too. This one does not have dimensions, so it is of little use for you.
Here is a link to the ERA site with the drawing. Perhaps there is more information on their site. Sorry I was of little help.
http://www.erareplicas.com/427/img/3pro_front.gif