It could be timing, but it sounds like a vacuum leak. You did hook up your wiper hose. I have seen that happen. Or did you possibly cross plug wires. My way of finding a vacuum leak is by putting something like Marvel Mystery oil in a pump oil can, plug the wiper fitting and squirt a little around manifold to head and manifold to carb. If it smokes white, you have found your vacuum leak. You could have a warped intake manifold that was fine until it was disturbed it. If thats the case, a machine shop can true it on a belt sander. By the way, when you timed it, did you have the distributor vacuum disconnected? If you time them with the vacuum connected, the advance may have had it retarded and you are too much advanced.
