Champion plenum for 90mm ford style throttle body. Fit's Champion intake, not a stock intake or ported stock intake. $150 +shipping I would also trade for a precision plenum for a stock intake.
I now have a new 90mm accufab throttlebody that can go with this. TPS sensor setup with gm plug, gaskets, IAC blockoff plate and hardware included. $300 for the throttle body, tps etc.