Having trouble getting a solid figure for this.

I think the Cusco is the same as the Exedy hyper single.

I'm needing it to hold as much power as possible later being I have a 800hp ready fully built motor and head but..... for now I need it to support 450whp and... 350ft/lbs or so.

 

Looks like 400hp at the crank is the limit. That won't near work.

 

These style light weight single disk clutches are more for small turbo or NA setups.

If you have a big turbo setup, you'll need a twin disk clutch

 

Agreed. The Competition Clutch and Tilton twin plates work wonders and only have to be rebuilt as opposed to buying an entire clutch. Although my factory clutch held out with 455whp for a while, haha.