please help with ...20" staggered wheels on my 67 cuda fb

im sure most people wont like this idea but i still need some answers....
so i just purchased a 8.25 rear end with the big bolt pattern and front disc brakes yesterday....my question is im wanting to put a 20" staggered wheels on the cuda like this one west coast customs did.. im wondering whats the widest wheel that will fit on the front and the rear...most of the staggered wheels ive looked into are 9 1/2-10 in in the rear and 8 1/2 in the front...will these fit