I have a custom build with an AMD 6350 processor and I have two available Radeon cards that I would like to use in a Crossfire configuration: An R9-380 and an R7-360. Can these cards be setup together in a Crossfire configuration?
No they cannot. The R9 380 is CrossFire compatible with an R9 380/380X. The R7 360 is compatible with the R7 260/260X and the R7 360. We always recommend using the same model (eg R7 360-R7 360) where possible to minimise the risk of any compatibility issues.