Big blocks have been done before, but there's not a "kit" or a ready-made list of parts to do it with. Most end up fabricating their own mounts and/or using motor plates, and putting a big-block in a II will require body and floorpan modifications.
Jack Roush build one with a 385-series big-block in the early 80s, and those are bigger than the FE-series 428s externally, so it's doable for sure, the question is how much time, money, and work do you want to put in it?
If a large-displacement screamer of an engine is what you want, you'd be better off building a stroked 351 Windsor, factory blocks can be taken as far as 393ci, and aftermarket blocks can go as high as 427ci if not higher. The external dimensions would still be the same as a 351W, meaning the extent of your fitment issues would be a little sledgehammer time on each fenderwell or on whatever headers you chose to run. With the outrageous cost of FE engine parts these days, either purchasing a crate stroker or building one could very well end up being cheaper.
__________________ 1976 Ford Mustang II Ghia: 302 with a 600cfm Edelbrock carb, Edelbrock Performer 289 intake, Dynomax Blackjack headers, 2.5" exhaust with Flowmaster Super 44s. RJS 11-gallon fuel cell, C4 tranny, chrome 16" pony wheels, fuzzy dice, brown vinyl half-top, and painted in the tackiest color ever (harvest gold, that's why I call it "The Goldenrod").
Also have a 2003 Dodge Ram (lightly modded daily driver/tow rig/office/dining room/home away from home/workshop... I call it "The Big Blue Dawg".) | 
