Fuel tank recommendations?

Thanks for all the recommendations guys, I ordered the Spectra Tank from Tamraz's on E-bay, a seller I have had several good transactions with. I checked the specs with that of all recommendations and aside from the more expensive stainless ones, it should fit the bill. Of note, every tank I checked, except one,
carried the number or variation of CR11C. While the prices and manufacturers and described material differed.
Now to pull the old one. Is it possible to remove and replace the tank while leaving the fill neck in place on a 69 fast back Cuda or easier to install the neck after tank is in?
Thanks again for all the input!
I used this product on my nw tank. One quart did the trick. Alcohol Resistant Gas Tank Sealer | Car Fuel Tank Sealer - hirschauto.com