In post 332 in that thread, you should contact Geoff at Full-Race. He makes great manifolds and may be able to help you out.
I have used his stuff in the past.
201,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here