while you are taking all those facts into consideration--add in the mix that the big block heads have weird combo of port shapes as the intake people outranked the cylinder head people and they made the manifold to have siamised ports while the new guys in the cylinder head dept had to reroute 4 ports to line up with manifold------


I would find some rectangle port heads to go with that intake and get rid of or use the oval ports on another engine-------sell'em--------