I'm installing a Lokar SS throttle cable on a small block 427" Windsor with dual quads. After trimming the cable as per the instructions, it is approx 42 inches long. My problem is the cable housing slips through the grommet on the firewall end when I push down on the pedal. This prevents the inner cable from activating the throttle. I am hesitant to compress the grommet for fear it will cause the throttle to stick. Help! Please?