Looking at some NA manifolds to adapt for 20b NA project. I would like to do a wrap around manifold similar to the Pierce manifolds. I believe this is what GTOrx7used for his ITB's. The one item I would like to understand is how far or close are the port and mounting locations from some of the other engine configurations (4 port Na, Turbo, REW). First thoughts are to adapt an old port lower RB manifold with their Dell' upper manifold to wrap around the engine from there I would adapt the ITB's. Or should I be trying to source the Pierce manifold though it appears they discontinued a few of them recently. Any other options? Plan on running a large streetport not PP.