Not sure of your year. 1975 may be a three piece hull but the 1980's were a one piece. Pull the rub rail to expose all the screws and silicone that hold the two together. Once you remove the fuel hose, deck hatches, wiring and console you can start prying the liner from the top of the stringers, it was held in place with bonding putty on my 1983. I made some wood wedges to drive in between the liner and top of the stringers. Once I got it going I used the mechanical advantage of two forklifts to hoist the liner free of the hull. It wasn't nearly as difficult as putting it all back together. Let us know how it goes.
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