Bart, stop giving away all of the secrets!
A few years ago people were throwing away log manifolds, now it seems like everyone wants big money for them.
I think that the logs got a bad rap, in part, due to the restrictive compression bent head pipes. With the outlets opened up like b-man has done above and mandrel bent head pipes like Pypes offers, logs can work just fine for many moderate performance applications. I've got a set on the stock appearing 455 in my Lemans that is currently putting out around 425 HP.
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1966 GTO
1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60'
1969 Bonneville Safari- cross country family cruiser. .
1979 Trans Am 400, 4-speed, 4 wheel disc.
View from the drivers seat racing down Atco Raceway-
http://www.youtube.com/watch?v=GhYDMdOEC7A
Ride along in the other lane-
http://www.youtube.com/watch?v=mIzgpLtF_uw