Car sputters

My car is doing the same thing as the origanal post beside the fuel leak, im was thinking it was the choke cause on cold days it would do it real bad but as soon as it warmmed up it would stop. here latley its allways doing it and the choke is wide open on a 80 deg day. my plugs ar good the timeing is not off cause it would do it all the time. its more like a vac leak i think but what is weird as soon as i park it revs fine. its allway when under a load, ill hit 40 mph and it starts and before i couldnt get on the highway id hit 60 and it would cut out. i was realy thinking it was the choke but now im stumped. Any Ideas? The fuel pump looks new, i realy dont think its spark cause the plugs are good. Does any one have a good link to rebuild a 1 brl carb. its a 68 dart 225