I have a 68" GTX survivor, all original in nice shape and have had for 10 years....its been a good car. I have a chance to work out a trade with a guy selling a 71" SSP, 383, 4bbl auto

Does anyone have any production numbers on these SSPs? I can't seem to find anything. I don't know how it performs with that low compression 383....havent driven it yet.
Any thoughts or feedback would be helpful to me with this possibility. I don't know what type of deal would be worked out. The cars are in about the same shape and originality. I do realize the GTX has a higher $ value.