welcome to the site and being a new V owner, I can't answer for the gas tanks, both of mine are different only because one is metal and the othere is poly, but they both hold 60 gals.
I think some of the pre 90 models had dual tanks but you can search on the site and you should be able to find that info. I remember others talking about the same set-up as what you have.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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