I have the opportunity to purchase a late 70's or early 80's Argo 8X8 for $400.00 dollars. The motor in it is froze, I believe he said it was a 18 hp. Was there anything I need to be aware of on these early argos (it does have the older body style) Or are they the same mechanically as the newer argos with just different motors and top tubs? Are the plastics diffent? Any info would be great. Thanks ghcoe.