440 stalls at idle

:banghead::banghead:I'm in of help have been building a 67 fastback for 10 years and am finally firing it up I've fixied all the normal bugs but one. After start up and choke opens engine stalls at idle after 20 to 30 seconds can't adjust to keep running can feather with pedal and it runs . Everything is new 750 holley edelbrock performer mild mopar purple shaft complete overhaul . I even removed intake and replaced gaskets thinking I had a vacumm leak. Getting ready to call Holley hotline in am but any suggestions would be a great help thanks in advance.