DSU54, I'm currently looking aa a 70 455 Bonne myself. I did some research and it could have either a 360 horse or a 370 horse 455. This was one post I got on another board about the 455 from a reputable source.
Though the large-valve 455 (no. 64 heads) was optional, it is likely equipped with a YH-code 455 with No. 15 heads and 1.96/1.66-inch valves. It will still have around a 10:1 compression ratio. Even with the small valves, it's still a good runner. It was factory rated at 360 hp and around 500 lb/ft of torque.
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