Yeah the viton seals should stay stationary on the top of the valveguide. I've found that it can be necessary to run vitons or PC on the exhaust guides as well if the guide clearance is on the high side. Oil can run down the valvestems and burn on the heads of the exhaust valves, making smoke and carbon. You don't see the residue on the plugs because it's burning on the exhaust valve.
Sure it's not a turbo problem?
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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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