51 buick help

okay i ahve a 51 buick special. my question is this. Hopefully some one here can help. now i am pulling my straight eight motor and putting in a 350. (it has been rebuild and has barly any miles on it if any one wants to buy it) No i know that I am going to have to change my rearend because I am not going to use the dynaflow trany any more i am putting in a 350 turbo trany. Now if any one knows about buicks you know that there is a shock arm and coils all around and that includes the rearend. I enently want to to bag it but want to know if any one has done this with a buick and how they did it. did you pull out the shock arm and ciols in the back just how do you do this and get a diferant rearend on the car. Please if any one has any info let me know because I hopfull will be putting the 350 in with in the next few weeks. thanks in advance