A header that has equal length tubes, smooth bends ( not dented up ) and are the correct diameter, will flow the exhaust gases just as well as a 1,900 set. You don't need adjustable collector's on a cruiser and that's what I was talking about. For a mild built small block 1 1/2" primary tube headers with a ceramic coating is a good choice, the smaller diameter tube headers will scavenge the combustion chamber not only faster more complete and that keeps from contaminating the next air / fuel mixture.