"custom turbo setup" is what I was looking towards. I wasn't wanting to "Install ecoboost".
Using some parts already made for other very similar applications, in order to piece together a custom setup...in the spirit of using 305 heads on 350 to bump compression in old chevys, or the previously mentioned gt40P swap on older Ford V8s
The way i see it, there's no reason to custom fab exhaust manifolds *IF* they're already made for an engine in the same family. I'm hoping the f-150 aftermarket makes upgraded manifolds that just HAPPEN to fit 3.7L heads as well, since they're so similar.
I guess I'll have to go take all these measurements myself....surely there's a wrecked ecoboost and a wrecked 3.7L in the same junkyard in this city....