Originally Posted by DADS50
If it is full of rusty crud you may want to consider replacing the tank.
rockauto.com sells a replacement tank for your truck for 167.00. Made by spectra. a Canadian company. Part number GM55A
Good Luck

That seems like a really good price when you consider a POR-15 tank sealing kit here is £60(roughly $90) and the Spectra tank works out at £102.
The £40 difference is worth the peace of mind knowing it's brand new.
My own tank sounds in a similar condition to to Scotts
As usual the killer for me would be shipping and import taxes.
Sometimes it sucks being on the wrong side of the 'pond!

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.