I am using a METCO driveshaft loop in my '64 Savoy, along with a TTI X-Pipe 3 inch exhaust system. I modified it, to be egg shaped with, 3/4 inch added to the loop above the driveshaft, and about 1 inch added to the loop below the driveshaft for clearance. Also added two gussets to the driveshaft loop to reinforce.