A lyscholm/twin screw would be ideal -- but its also the most pricey. I'm thinking of this as a "bang for the buck" project for somebody who can weld and has time on their hands (sadly, not me).
I'd have to check sizing recommendations, but I think either old MP90 or TVS 1900 would do the job. As its intended to be A2W, you could get away with a smallish core (too big isn't good for flow anyway), then add in a big Johnson water pump and a HE up front -- the one off the Ford Lightening would probably work (I've used it before).
Short piping in and out of the IC core means no lost boost and great responsiveness. 2.5" inelt/outlet piping will be plenty big for up to 450 hp.
Pre-SC piping could be kept OEM so OEM MAF's (so long as they didn't peg at 5 v) would work great.
It wouldn't have quite as much top end as the centrifugal blower or turbo kits, but the off-idle torque would be seat pinning.
Oh, yeah... I forgot. There's need to be a big bracket in the front for an idler pulley and some experimenting with belts. And probably dual catch cans, but a lot of the components could be "parts bin" and then modified as needed to fit (brackets would need to be cut out of aluminum of course).
Keeping OEM lower mani means you can use OEM gaskets and FPIG for the rest.
I've done this before, but smaller motor, and had a lot of assistance with the tough parts...
If anyone checking this thread out is feeling inspired, but dubious on fitting the IC core in such a tight area (understandable), another option would be direct port W/I. So long as its after the blower, but before lower mani, it would work great.
More compact design, but then you need something like this
https://www.coolingmist.com/pagedisp...Key=DirectPort (I've done this with great sucess before too
)
Actually, if you do it that way you'd only need to fab a bracket for the SC to upper mani, one for the back of the SC with the intake piping from TB welded to the bracket, and then add in your port water/methanol injectors.
You could run the pump and tank from the rear (or relocate the battery I suppose).
Except for top end power, this set up would absolutely blow away anything else currently available -- you'd have tons of grunt right off of idle, and a flat torque curve like a table top.
The Z would feel like it had a V8, and perform like it too...
(wistful sigh)