Hard start !!! :(

Hello guys! YOU are needed again. I have 72 scamp 318 v8 2 bbrl. I have a recent development. The car is having a random hard starting issue. especially after the car sits for a period of time. It will crank but not start. In the morning when its cold i put a ink pen to open the butterfly a bit and she will go. is there a adjusting screw to open the butterfly a little. I wired the butterfly open at all times. That helped but hard to start all the time. New carb time ? Please help.