Is the distributor timing clamp tight? If not, maybe the distibutor has moved, throwing the timing off.
Dale
I think you may be on to something...
What is this part...
http://farm8.staticflickr.com/7020/6801172421_345f7eaa7b_o.jpgIt is currently hitting the push rod cover. Don't remember it doing that when I reinstalled it and did the timing.
Hopefully I can get under the hood this weekend and check it out when I have some daylight.
This would also explain some issues I noticed before installing the new carburetor.