Speedometer cable for a 69, NJ, four speed car with drag pack adapter. Existing; empty plastic loop just about the middle of the firewall and 3" above the RF brake line. One ' C ' shaped strap with hex head screw attaching to the tunnel on the passenger side just above the bell housing. Is there another clip location on the firewall somewhere ? The only solid attachment, now, is the ' C ' clamp/strap in the tunnel. Thanks, Brian