[68 P.O.S.]

Since you're using your truck as a cruiser, stock manifolds will be just fine. However, if you still want go with headers, get a set of tri-y's, like Doug's or Doug Thorley. They'll help where you'll need it and drive it; increased low to midrange rpm torque and increased throttle response. Not a huge increase, you may not even really notice. As long as you get a high quality set of headers, which aren't cheap, you'll have no more problems than you would with stock manifolds. All the problems people describe are from cheap, $99 headers. This is the area where quality really pays off. But again, your stock manifolds will work just fine for your purposes.