I just finished restoring the Trans Am's air cleaner base plate. The original had been run over by the previous owner in his haste to put out the engine fire that was attempting to immolate the entire car. I ended up using a small chisel to remove the passenger side snorkel and transplanted the passenger side snorkel from a standard four barrel dual snorkel 1972 air cleaner (they use the same snorkels), that I got off of ebay reasonably cheap. Instead of trying to weld that paper thin metal back together, I used some 2 part steel epoxy. It is actually holding it together better than any weld would and looks just like it was factory installed.
The fun part was removing the thermactor heat riser valves from the snorkels. It's easy to bend the tab and get the units out, but to reinstall the retaining tabs you need to use a special tool: My late Grandfather left me a pair of long wood vise clamps. You put one leg of the clamp down the mouth of the snorkle and the other on top of the thermactor bracket and tighten. It bends the interior tab forward perfectly. Sure beats trying to pry and tap with a long chisel and hammer. Thanks Grampa!
I also used paint stripper to remove all the factory paint. Once it was together I used Rustoleum Satin Black which duplicated the factory finish exactly. Another backyard auto restoration success story.
BEFORE:
