[/quote]head number is C6AE-R what's an unported P.I. ? Friend of mine has a single plane manifold for $ 200., I think he said it was called a Streetmaster, but he doesn't reccomend I use it, something about being no good at low RPMs.
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Not sure why your friend thinks the Streetmaster would have poor low end power. I bought a new Streetmaster in 1976 shortly after they first came out, and they were advertised a low RPM RV style intake. I modified my Streetmaster with the instuctions provided from Edelbrock, and used it on my 12 second 390 66 Fairlane GTA. I have also used them on my 70 428CJ 70 Mach 1, and even my low 10 second 428 Fairmont. Jays FE intake book showed the Streetmaster to be a very good choice for many FE applications. If you do get the Streetmaster, hopefully the 4 special intake bolts are with it. Due to the tight space around the # 2,3,6,& 7 intake runners, Edelbrock supplied 4 special bolts, with a small 7/16" bolt head. They look like really long header bolts. As for headers, maybe give Stan at FPA a call, I bought a pair of FPA headers that were designed for the 57-59 Ford cars, they tuck in quite closely to the block, so maybe they will work with a earlier car as well. Chances are Stan would be able to tell you about that. Good luck.