Don,

I brought the tank off of my Model B to my radiator shop. He tanked it out fixed the peppered bottom and coated the inside of the tank with a special sealer for fuel tanks. Came out beautiful! Cost me around $75. If you have a good radiator man close by, might be worth while asking if they fix fuel tanks.... Steve

I have done the fuel tank repair several times and this is really the best fix I've found: It is a little work....
Clean the tank out well with water (hose it out good a few times) then use some solvent (toluene [Lacquer thinner], or MEK (Sears stocks this) and slosh it out again...you want to get ALL the gum out from old gas....
Get some Naval Jelly rust remover, (the pink stuff, no coating) and some BB's....Put these in the tank and shake rattle and roll....a little compressed air during the rinses makes the BB's really knock out the scale....rinse several times, then get the BB's out....let it dry a day or two....
Get a quart of aircraft gas tank sloshing sealer (I always use Randolph brand) (www.aircraft-spruce.com has this). Dump this in the DRY tank...(after taping the holes with masking tape) Slosh it and dump the remainder back in the can. Let it dry overnight....
That's it...This is a good fix and 1 qt. of sealer will do about 3 18-20 gal tanks....
The sloshing sealer comes in white or yellow...yellow is for fuels which will NEVER contain alcohol...(diesel, avgas) white for everything else....