I was quoted $1,200 to cut the roof off and replace with a good one. (Use to be a vinyl top car ) That sounds fair to me because of all the bracing and cutting involved.
doesnt sound to bad...does it include mud work and primer? Where is the roof being cut? If the donor roof was cut below welds, it is pretty easy and wont take nearly as long. I had a 69 fastback roof replaced (cut below the welds) and it cost me $800. Average bodywork is $40/hr around here.