If you wanted to take the basic architecture of the 7.3 and build an aluminum block version at 7.0 liters, the bore could stay at 107.2mm and a stroke of 97mm would get you there!
However, if your going to do an aluminum block say for Mustang or F150, the next question would be do you adjust the deck height down to say about 237mm from 256mm? Probably!
When your done, it would be pretty low volume say 20,000 per year. Very difficult to justify unless someone other than Windsor does it!
cylinder head design looks good even for a 605 hp naturally aspirated 7.0 liter version of the 7.3.
edselford