Thanks for the replies. I've decided to use the KISS principle and go with the as cast heads using my current rockers and manifolds for now. I think the 290 ported heads might be a little bit of overkill with the current engine specs. Also if I decide to go for more performance at a later date I'd probably want more than 290cfm heads. Currently my best time is 12.68 @ 107.98 and I still have fun cruising the hiways at speed.
FWIW I still have the original numbers matching 400HO engine and TH400 trans that I pulled out for the "new" engine build. The current engine is a '73 400 block with period and date correct heads and manifold that I can use on the original engine if ever needed.
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