I have a 1974 Buick Riv stage 1 455 engine, I am wondering what I am going to need to do to bring it close to the 70 455 torque and horsepower rating. It does have the stage 1 heads but I know they are lower torque and power ratings then the 70. I do not want to get crazy with this engine I want to keep it fairly stock possibly a mild cam if needed. The cam that is in the engine they say Buick put in a different cam for the rivs so they had more torque and smoother idle then the A body stage cams. Uncertain how true this is, it was just something I read. Thanks in advance for any advice and input.