['ol Pinion head]

In restoring these bases, I have always examined the spot welded on tabs on questionable '70-72 TransAm shaker bases to see if the tabs were factory installed with small spotwelds, brazed on, or sloppy spotted with a MIG.

A thought... quite a few single heat riser dual snorkle Formula bases have been made into T/A bases over the years. I've only examined one factory dual snorkel T/A base with a single heatriser that had factory tabs which did not appear to be effed with. Very uncommon to run across such a shaker base, nearly all of the '70 TransAm bases I've repaired or restored were single snorkel original RA III bases, two were RA4 T/A bases.