Well I'm not positive on the years, but being allround car enthusiast I've kind of kept track of the HP ratings.
When the first Camaros came out(LT1) they were rated at 275 HP. 2 or 3 years later they bumped them to 285 HP. Then they put the LS1 in the car and was rated at 305 HP.
That is what they were rated in Canada. Like I said not sure on the years, but I'm positive on the HP numbers.
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White 1995 Mustang GT
Dynomax Cat-Back, Offroad H-pipe, K&N Filters w/o Air Silencer
My 1995 Mustang GT