By upper he is refering to the heads - not the intake manifolds.
It doesn't matter really what manifold you go with (Non/SVT/3.0L). Straight/Hybrid references are all about which cylinder heads and cams you go with since the compression ratio is affected significantly by what combination you choose.
The term Hybrid means a combination of 2 different things...in this case that just happen to fit together.
Remember back to high school biology...Pink roses do not exist alone...But red and White ones do. So when you mate together a Red and a White Rose, your Hybrid rose is now pink.
Same with the engines...When you mate together the 3L bottom end (Block and all the internal components), and a 2.5L Top end (heads, valvetrain, cams, intake, etc), you get a hybrid engine. Whether it is an SVT or not, does not matter.
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