On my sbc 350 powered, tube chassis, '69 Volkswagen Squareback project, I have an exhaust question. How close can my exhaust manifold be to ny upper control arms without the worry of having bushing failure due to manifold heat? I am running Mustang II front suspension with tubular control arms. Also, opinions on flexible pipe from manifold to exhaust pipe. I am cramped for space and don't have a wide area to work in.