Model 410,415,440 Aft Cabin Fuel Tanks

[Cap10patNC]

Anyone familiar with the 41 Aft Cabin of the late 80s? Models above are similar. I'm looking a these boats but I'm concerned about the fuel tanks.
I believe they have 2 x 200 gal aluminum tanks. If I have to replace them I wonder what is involved. Does anyone have any idea?

Thanks
Cap10pat