I was looking to see if my f250 was a early or late 99, so i read the door tag and it said 12/98. I read that the cut off was 12/7/98 so i got worried. I looked on the valve cover and it said the 15th. Do i have a 98 front end? It it bad that it was made so close to the 7th?

 

Even though the tag says "98, it is still a '99,: remember new vehicles are always made in the year before the said date.
sounds like you have a late '99 on your hands.

 

what door badge does it have? how big are the intake plenums?

 

it does not have stock badges but the p.o. added t44e under the door