There is one company that makes adapter plates to run an LSA or LS9 supercharger on the LS7. I think it might run any one that fits LS3 style heads.
http://www.ebay.com/itm/Billet-LS3-t...ae00c3&vxp=mtr

E-Force for me, too.

http://i725.photobucket.com/albums/w...n/IMG_0341.jpg

While superchargers make big power down low.... don't forget if you pulley them aggressively you can see a few bad things: belt slip and namely heat soak,

As others have suggested buy a used CTSv blower (ctsvowners.com) and plop some LSA/LS9 heads on your shortblock with appropriate cam and it will make 650rwhp and drive great. Their main downfall is heat soak though.... so if you do back to back passes or plan to road race it.... it will not run cool. A large reservoir helps.... but that will only prolong the heat soak.

The centrifugal blowers suffer from less heat soak.....

I haven't seen ANY E-Force blowers make big numbers on the dyno.... and not at the track either. A stock CTSv blower, stock heads, smaller pulley, cam/headers, e85/inj will run 10's all day long with a manual trans.... low 10's with an auto or faster.

Turbo's work too :) Boost by gear is a wonderful thing:
My other RX-7.... running a 100% stock T56 Magnum and McLeod twin disc.
https://www.youtube.com/watch?v=y472n4EbWO0

any reason not to look at Procharger
 

I too am interested in a blower type setup but do not want to run a cowl hood. i have been looking into the F1a for a similar 370 ish build with a LQ4. also looking for high 6 low 700 at the crank. I have been getting mixed up as it will get me the power goal but not sure if it is right for the autocross/ road race plans. any one have thoughts on if this may be a better option for the OP aswell as myself.

Here is what was last in my Nova.
2.8l Kenne Bell!

http://i300.photobucket.com/albums/n...psxfrgmn1q.jpg

Are you using the Infinity Box components?

No picture love for the Whipples?! Kidding... all of the roots blowers are nice. I'm not partial.

http://i49.photobucket.com/albums/f2...527_191255.jpg

I like the Maggie 2300. Black