They are still called a widsor by ford motor company....the 99s did have P.I heads which are quite a bit better thn the ones used in previous years. The 4.6 is 281 ci not sure where he got 273 from.
The blowing sparkplug holes are "somewhat" common as in ive done a few while working for a dealership. Never seen one in a mustang all have been f-150s. Either the plugs where looose from the factory or somehow they managed to loosen up. then they just "wollow out the hole. May wanna make sure they are all torqued to spec.
Luka
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