Manny,

Best guess problem area is the stem seals, if you have them. Some Ford 2.3 did not use stem seals, just the stem/guide clearance (being cast iron, it works for a while).

Best procedure is to remove the head, and knurl the guides for proper clearance, check the seats for cracks (while it's off), and regrind seats and valves for best sealing.

Cure the leak, and improve performance for a more trouble free season!! What a deal.

Or run a hotter plug to deal with the oil.

Good racing,

Bill