240Z gas tank woes

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I have been dealing with a somewhat on-going issue with the gas tank in my 72 240Z.  the seam where the top and bottom parts of the tank meet has been a source of a leak.  I had previously used JB Weld "Steelstick" to seal it, and it worked.....for a bit,... then the leaks came back.  So, in reading online about ways to fix it, in car, I found out that POR-15 makes a sealer that comes in a tube that is supossedly a permanenet fix for a fuel leak.  it is one tube that you squeeze out, and it costs 30-35 bucks!  At any rate, I climbed under the car, and with a hammer and a screwdriver...1-2 wacks and the old JB weld "glob" came off (see pics).  I then wiped down the area with some denatured alcohol and a rag, and then laid in the sealeant and then used a finger to smooth it out and then made sure it covered the seam and the edge and iunderneath.  As they advised me, I used rubber gloves to do it, as this stuff apparently doesn't like to come off....pretty cool to finish the job, peel the glvoes off and have clean hands and no scrubbing! I have had this gas tank out, and blocked off ports and switched the fuel system over to a basic one overflow hose up and over to a breather at the end, eliminating the fumes tank that used to be in the quarter panel.  It's a good tank, clean insdie and all....but the seam right at the front edge was leaking.  Crossed fingers this fixes it.  See pics!

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UPDATE: Thanks. S30World has a few new gas tanks for sale on eBay. I just ordered one. it has the extra ports so, ill just weld them closed.....I am going to have the seams welded and possibly powdercoat the tank. Pricy, but this Z is a keeper and I don't want to have to keep dealing with fuel leaks....I'm tired of it! Also got some new rubber pads for the top to go with it.