If u have a c30 rotrex is it a c30-84 or c30-94 series, since the Gta is a 3.2 size was is ok and probably good for a maximum of upto 400 to it's limit. Auto-delta I think use the 94 on their standard supercharged conversion, standard internals, remap of ecu and get around 320 I think, forged internals I think is a must especially if ur gonna run higher boost, I'm sure the ecu can be remapped but by someone who is reputable, someone has run standalone and kept original functions working, don't know what they used. If I were to supercharge from scratch, I would go with c38 charger, forged internals, and a ecu remap if possible. I think u need to find someone who can map ur engine properly. Main reason ur engine broke was prob not internals but remap.