If they are truly just pin holes they will be easily fixed by using Redkote tank liner or another simular product. If they're much larger than a pencil lead they should be brazed shut first. The is no reason you cant re-use your original tank just because of pin holes. If you choose to clean and re-line your tank be sure to follow the instructions to the T. Those that complain about tank liners failing are those that didn't follow instructions. I've used Kreem and Redkote on different vehicles and much prefer Redkote. I buy it locally at a Bumper-To-Bumper jobber but you should be able to order it from about any parts house.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.