i was changing the fuel filter the other day and was looking at the valve cover tag and it said 305hp. but i have a 4 speed tranny. is this maybe a swap or a different tag? i dont know wether this is 47 or a 48. thanks in advance. ps i couldnt find any other posts on this but if there is i would geatly appreciate it. plus, is this the HO enigne for the 04 year?