I've got a 350 Classic. I've just orderd a factory sports exhaust system and Amal carb. I've got a set of Samrat rockers to fit after the exhaust and carb. I'll try each one independently to assess its benfits. At the moment she's only done about 600 miles and is happy cruising at 50-55mph. It seems as if she can't breathe after that hence the new parts. I know the engine is still fairly tight but do you think she'll be able to cruise at 70mph? When I was a lad my friend had a 55 350 Bullet and that would cruise at 70.