Technical edelbrock carb

So i put a new AVS 650 on my 66 327 stock 350hp heads, 69 lt1 intake and l79 cam. same carb i had on it before just shinny. Now I cant get the throttle as crisp as it was. If I Rad the throttle it responds but Seems to return to idle very slow. Old carb was great!! This new one also has a small miss on light driving with next to no throttle at all (like a stubble) but wide open is fine. Spoke with edelbrock and go figure?? " We haven't had this problem before". Any help would be greatly appreciated. Are mettering rod springs to light, float levels off?? Also has edelbrock subbed out their work across the pond?

 

You may have a vacuum leak.

 

^^^^what he said^^^^

 

10 4. I checked but will pull it all apart this weekend and replace everything. Never had this problem before. Thanks for the advice