Hi all. I went over to the paint shop today and got my 68 running a little better. I checked the firing order and it was right. I checked the point gap it was big so I reset the gap. Reset the timing and if I run the engine up to 1,200 rpm,s it smoothes right out. But when you set it at 600 rpm like the book calls for it shakes. I checked for vacuum leaks but could not find any. Any help on this would be great. Thank you all. Bob