RE: H3 "Super Charged"
The Head Unit looks like a Vortech (Will have Oil Lines)or Powerdyne (Internal Belt or the new gear driven with self contained oil), Your Boost is more than likely 6-8 psi. Did it come with a blow-off valve? Most of those type superchargers (centrifuge) use about 13% of your HP.
Note that Centrifuge types are not that linear, as your revs increase so will boost. Roots-type are little more linear.
I would get a boost gauge and A/R ratio gauge or a DashHawk tokeep an eye on rich /lean conditions. Did you get replacement injectors?
Having the Alpha come outstymies the aftermarket to make power-addersfor a 5 cylinder.
As far as putting a V8 in, a Crate motor almost cost as much, then you have to get wiring harness, PCM, motor mounts, exhaust, change shocks and springs, front suspension parts.So I don't know were you get off saying it's cheaper, if you want to do it RIGHT.
I see STS has a setup coming out, thats a good company, when I was in the Dodge arena I knew a few guys had them on there Hemi's and were getting tremendous performance with little boost.