I saw this at the PRI show in Dec and asked them if they had one for a raised runner head and they said no. I was on the list from Wilson Manifolds when they were making one but never produced one because they had problems with the Mold sealing so said the AFR rep.
I brought this up to another engine builder and he said he wasn't to impressed with the ports but I have yet to see one in action to know if there are real upsides to using it.