Another Height question

[AASmedic]

Good day all, I know this has been asked many, many times but I cant seem to find it. I am looking to find the stock height of a 72 K20. I am thinking of installing a 2" lift but want to know where I am starting from. I know that the original springs are still in the truck and they are sagging badly (front is about 1 inch from the bump stops). Also, any recommendations on front and rear leaf springs and if I need to change out the pittman arm or not. Thanks for the help.