I bought a set of those heads (not from Mancini) from a member on here 5+yrs ago that where ported all the way to the valve seats, not just at the first 1/2 inch into the intake ports like Edlebrock says they made them originally
I've had problems with the Hughes offset rocker arms( switch to Harland Sharps after that) as well as the pushrods rubbing on my 400 block with Isky Offset intake roller lifters, my message is I'm not real happy with these heads but I will continue to use them after freshening that motor this winter. I changed that motor out last winter and it has been on a engine stand since then, maybe I can fix the pushrod rubbing problem permanently by removing more material from the heads or using a intake rocker arm with more offset on them