rear suspension repalcement

Im going to be removing the rear suspension from my 72. I plan on replacing all bushings and rubbers back there. I havent driven the car since I bought it an brought it home so I have no idea how it rides. Should I consider a replacemment spring while Im at it and if so what are your recommendations. Also I want to know where is the best replacement kit supplied from for the bushings so I can buy everything at one time in one kit? Last question is should the strut rods on the back be upgraded to the adjustable type? I plan on ordering this all on Monday so your advice will be appreciated.
Thanks
Rodney