67 w/ 283 running rough

[dauntless_powered]

So I have recently acquired a 67 swb 4x4 w/ the orig 283. We have had it in storage for a couple years and the fuel had stabil in it. Every time we have started it while in storage all I had to do was pull the choke, pump the gas once and she fired right up and purred like a kitten. Well, when I went to grab it and bring it down here in CT I drove it maybe 30 feet and she started running like crap. I got her home and she is still running horrible, spitting, popping, acting like she is way rich, and sputtering really bad to the point of not being able to keep it running really. Like I said before this she ran and purred like a kitten, the entire drivetrain was rebuilt right before I got it (less than 1500 miles ago) I have replaced plugs, wires, cap, rotor, rebuilt the rochester 2 bbl, along with fresh gas and still the same thing. I have 12v on each side of the coil when power is applied could it be bad internally? What ever is causing this came along very suddenly? Any ideas, thanks in advance