I think Eddys may be the best value. Especially for a performance street build. If you have a good and trusted head machinist/builder? I would buy bare. And let the shop buy the valves and assemblies. They may already have a set of stainless valves (As an example) That may work much better with their port job. It also gives them more options than just dropping off Edelbrock's parts and assembly. Im not suggesting just giving the shop free reign on decisions? But to allow some flexibility. JMO of course.