Rocky,
Thanks for the comments on the LeMans. It was, without a doubt, the best Pontiac I've ever owned. It did everything well! Actually, I don't own it anymore, but it has remained in my barn since the change of ownership. The current owner, who has never driven the car, is interested in selling it due to personal issues that have come up. Anybody interest? See the June 1997 HPP for info.
I think the '72 H.O. intake and '71 H.O. Q-jet are both good pieces that will add a few horses to your combination. More so the '71 H.O. Q-jet because of its increased airflow - the result of the booster venturies being removed.
I honestly do not know if there is any flow difference between stock 197 and 7F6 heads. It is probably minimal, if there is any difference at all.
About the only advantages over stock D-ports are the taller intake ports, and the fact that the center-two exhaust ports have better separation (not siamesed together) for better header designs. Since you are running the good cast iron D-port exhaust manifolds already, I won't switch to round ports either.
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