The Chinese "copy" is a better casting than the one they copied.
Have you seen a set in person? I have.
ProMaxx wanted my cylinder head business, so they sent me a set of FE heads and a set of SBF heads to check out. I looked at them and then shipped them back. It's the principle of something being directly copied in order to sell them cheaply....i.e. ProMaxx, ProComp, Speedmaster, etc. ProComp/Speedmaster did that with MSD, CHI, you name it, and all of their stuff is junk.
As Joe said, CNC/hand-ported Edelbrocks have been going to 360-380 cfm for years. Nothing special about a 345cfm FE head with a 2.190" valve. A Trick Flow head is pretty much there, but with a much smaller port.