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Dodo is a forum member, I think he's in Germany. He seems like a good gearhead.

A lower manifold/runners that jive with GE head and GTE upper plenum sounds great, but GTE uppers are getting scarce and pricey now, too... So Maybe he should plan to build uppers, too.

The adaptor to fit a GTE upper to a GE lower is not a particularly straightforward deal to install, so this could be a nice improvement.

I'll beat this drum again: torque curve is highly influenced by the length of the intake ports in the head - plus the runner length of the intake manifold. Longer = lower rpm torque, shorter = higher rpm torque. Usually, making runners shorter than oem will only be a net-benefit if you run well past the stock redline.
 
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