kap008

My 1968 Mustang begins to shake around 45-50 mph. It has a 302 in it that was rebuilt in 2010, but the shaking is recent. The shock tower braces appear to be fine, the tires are new and balanced. I'm wondering if adding a monte carlo bar would help? I wouldn't call it a violent shake but it's very noticeable. ALSO it will occasionally steer to the left, or right, on it's own. Are these problems related? HELP!