Life's a Garden, dig it!
Like many platforms, bore and stroke (with the appropriately sized rods) can provide for huge jumps in cubic inches though. Not sure which Ford platforms allow for what sizes to be attained, but 390 to 460 wouldn't surprise me.I’m not a Ford guy but boring out a 390 to a 460 sounded like too much to me. I looked into it real quick and it seems I was correct. Looks like 428 is Max and not considered safe for cooling. .30 over bring the preferred safe bore.
looky here:Maximum Bore - Ford Truck Enthusiasts Forums