hey stangnet

edelbrock does not have bolts running through the top. I have an old performer and you have to pull the plate off the plenum to access the mounting bolt on the inside. Its a typhoon. The seller was probably throwing the word gt40 around since its a more recognizeable term than typhoon :shrug:
 
Heads: AFR185s, AFR205s, TFS190s, TFS 205s; Ported Vic Jr.s
Intake: Systemax II (ported), TFS-R (Box if going solid roller), SuperVictor (if going solid)
cam: solid or roller