if u just go to a parts stor and get gas tank sealer it works good like 25 bucks a quart i had the same trouble used it and it fixed my tank good as new
You could always lay down an aluminum sheet to cover the hole and put a fuel cell in as an alternative.....
I've got a drop in tank in great shape from a 69 cougar, very clean, Mavaholic do you think it might work...If anybody can use it I'll let it go cheap...Jim