well i know i will get flamed for saying this but that stock t56 will not survive 800 hp.. but a decent mileage 01 or 02 is about 4K with manual tranny on ebay! turbo pistons for an LS are expensive!! W2W has a set of 8:1 mahles for almost 1000 bucks, and rods are not cheap either!.. i fyou have the money i could get the turbo rotating assembly from W2W,
http://www.w2wpowertrain.com/pc-69-3...plication.aspx but im sure it can be done cheaper..
Schwartz performance (link on the left side of your screen) can make you a turbo header for about 1K, Nitrorocket a user here has talked about making a run of tubular chevelle LS1 turbo headers, but they will run alittle more... but look awesome.. PM him and i am sure you guys can work somthing out..