Dear Randy;

For the best torque leave it (the exhaust) stock, or use the 292 CID (3 bolt) manifold.

Headers/dual exhaust add to the "top end" and remove extra heat from the engine.

Running headers/duals into a single pipe is a waste of time & money and defeats their purpose.

Checking past posts on this may help you understand.

Good luck. \:\)

John M., I.I. #3370

"There are no shortcuts to any place worth going". -Anon