Those covers on the floor are not fuel tank covers they are fish boxs!! In 1975 the tanks were on the sides under the gunnles 20 gal a side for 40 gal total.
But 3/4 starboard would work fine I am sure for your tank cover!, Its very strong stuff, I am over 300 pounds and I could jump on that all day and be fine.
But it is pricey!!
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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