Hello Thriller,
You are totally right, in 1975 the 455 produced around 205 hp in 1975. However, the engine I currently have in the car is a 430, probably a 68' or a 69'. It is probably making around 360 hp at the moment, maybe a tad more considering the 3 inches straight pipe exhaust system. I am not willing to build a super beefy engine, I was planning on getting a new camshafts + springs and maybe upgrade the cooling system.