Dodge D50 BBM
I think - if performance and upgrades are where it's going - that a set of custom made headers is worth doing. I'm one to devalue my own time but at some point it has to be worth something to not have to cut up and re-coat a new set of shelf headers. Custom made will get you fit, appearance, ease of maintenance, tunability, and performance. Would you drop another $500 beyond the cost of the shelf units to get the rest?