just found an article you might be interested in, Super Ford, jan 1996 has a build up of two big ol fords and a list of combos for bore and stroke.
Dodge rod and 3.970 stroke, .080" over bore will net you 491 inches.
And funny thing there is a 565 inch, tfs headed, nitrous fed, 1000hp in a 19 foot cp that only runs 99.8 mph. It belongs to Jon and James Cloud, I think they were on here at one time.
You should see if you can get a back issue, lots of good info.