Gas Tank Renew. Used to be about $500.00 10 years ago. Good reviews from people I know who used them. Came back looking like new OEM tanks.
If you really want to save some money, look up the price for a '69 B-body tank (with the rear fill location). From another poster in here, can use the existing C-body straps and filler neck. Just less total capacity (like 19 gallons vs 24 gallons). Quite interesting how close the two tanks are in size, plus the price difference.
Enjoy!
CBODY67