best hi flow ex manifold/drivers side

There was a manifold shootout a long time ago in one of the mopar magazine I think, they found one of the magnums and one of the 340's gave the best result, can't remember which side was which, but there wasn't a huge difference between the 340 & Magnums and even the 360 ones too.

Here's another shootout, no magnums just 318/340/360 & some headers

https://www.motortrend.com/articles/mopp-0307-installing-exhaust-headers-into-300hp-crate-engine/

Legend318:Stock '69 A-Body exhaust manifolds with 24-inch extensions360:Stock '77 360 iron log-style exhaust manifolds with 24-inch extensions340:Stock '70 340hp exhaust manifolds with 24-inch extensionsSHT:Hedman 151/48-inch-tube shorty headers with 24-inch extensions 1 58: Hooker Competition 1 58-inch ceramic-coated header tti: Tube Technologies Inc. 1 58x1 34-inch chrome step header 1 34: Hooker Super Competition 1 34-inch header; bare, uncoated