Thank you for the very useful info. I will look hard at everything under her while the tank is out. I'm hoping I can clean the tank I have but got a Liland Global tank from rock auto. It was even cheaper than the Spectra lol. I'm hoping there will be very little rot underneath since the car was only on the road for 10 years before heated storage when I got my hands on her.Spectra premium tank? Just a heads up they are "slightly" smaller than the original tank. I had the tank replaced in my 69 Tbird and I saw the tank was lightly smaller. Nothing to worry about mind you. It fit just as well as the original. You are going to have a PITA trying to drop the tank with the axle and exhaust in the way. Though now would be a good time to pull all that out and inspect for corrosion and rot. Also everything underneath.
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The last image is especially important. Those I feel are prone to rotting out.