8 3/4 out of d100 question

I have come across a 8 3/4 out of a d100. My question is how hard would it be to fit it under my 70 swinger? What all would have to be done? I currently have a 7 1/4. Or would it be easier to get a 8.8 out of a 98 and newer exploder? I eventually want to put a 440 in my car and I know the 7 1/4 won't stand up to that.
Any help would be appreciated.