8 1/4 suregrip question

Ok so I am trying to make it to the dragstrip this weekend and i have a 74 dart with 8 1/4 rear and I have a 01 durango 8 1/4 suregrip rear my guestion is can I use the suregrip gears in my 8 1/4 in the dart i know that 8 3/4 is the best way to go and i have one that is shortened, trused, moser axles, disc brake, and 489 suregrip . The problem with putting that in is time its setup for spring relo, and the backspacing on wheels is totally different. Am i p.ssin in the wind or is there a way to use durango gears.