340 manifolds
IMO just use 360 log style manifolds in the Mopar Muscle article that I even made a copy of the "vaunted"(and I use that term LIGHTLY) 340 HP manifolds out performed LOG 318 manifolds by 4 HP and 6 torque and outperformed the log 360 manifolds by 1 HP and 2 torque. This was on a 300 HP engine.... does not seem like much of a power gain for that kind of $$$ its kinda like the Extrude hone myth....you get 1-2 more HP for what $600 bucks???? guess if thats worth it to ya go for it but seems like a lot of $$$ for MINIMAL gains. I was all worried about this also and wanted 340 HPs' for my car also...but then saw that article and started laughing....
http://www.moparmusclemagazine.com/techarticles/155_0307_exhaust/index.html