dead spot at full throttle...

[The Blue Pig]

This is actually a problem we are having with my girlfriends 74 half ton. Cherry red, 4/6 drop, short fleet, 350, has an Edelbrock 650 manual on top, and I think that is what the problem is. It starts out fine, and it accelerates ok, until you get just before WOT, then it hits a dead spot and its like that all the way to the floor. At first I thought the weights on her distributor might be frozen and they were not advancing the timing, but that would be more of an RPM thing, not a throttle position thing, cause you can get it to 5000 on the tach, it just takes a while. So I was thinking the only thing directly related to the postion the throttle is in is the carb. I have never had an edelbrock apart, only hollies. Is there some sort of power valve? If it was the accelerator pump, wouldnt the problem be there at all throttle positions? Any help would be appreciated. thanks. gotta get it fixed. Just put an auburn pro series limited slip fitted with 3.73's, gotta try them out.