People are not willing to break up a set. I have a new head for 500.00. If you have your old head you can use the valve train out of it and swap it over. I do have two 44,000 mile 03 heads that went lean, i could take the valve train out so you have a complete head for 50.00 more. With used heads you are taking achance but with a new head you are not. http://www.svtperformance.com/forum...igh-flow-cylinder-head-drivers-side-only.html
unless the right hand side head is interchangable with the left like the heads on GM LS series heads... all you have to do is block off a freeze plug for coolant. Not sure if this appies to modular motors as well