Sluggish off the line! HELP!

ok, I have a 1968 Rebuilt 289ci with 302 heads, an edelbrock performer 289 intake with an edelbrock 600cfm 4brl carb, stock dizzy with new insides (still points). I changed my plugs which were really fouled, set my spark wires accord to chilton (two were in the wrong order). Im sitting at 15in of vacuum steady, carb vacuum tuned to highest vacuum possible. Im sitting at 8BTDC on my timing(max I can go before I get ping). it idles and starts up A LOT better with the new plugs and correct spark pattern, but from a dead stop, if I gas it hard it bogs down for about 5-8 seconds then picks up, its really bothering me because when I had the stock 2brl on there I NEVER had that problem, someone please point me in the right direction.

Thank you
Stan