Haha I just asked this in the Race section. I think one is the coolface option with the hole in the foot to lube the lobe. The other is the cam saver, that has a relief ground into the side of the lifter to leak oil over the lobe.
Look for my lifter post in the race section.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum.
White '67 LeMans 407/TH350/Ford 3.89... RIP
Red '67 LeMans. 407/TH400/Ford 3.25
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