So I just completed a frame swap project on my 65 vert, and last night, for the first time in a year, I took her for a spin, how I missed "top down warm summer night" driving! but am grateful for the opportunity to cruise a little yet this summer. Anyway, during the ride, the car had a very slight surge at cruising speeds. It was almost imperceptable, and it took about 20 minutes of driving before I convinced myself it was actually there. Its got an updated electronic ignition, no points, new, plugs and wires, cap and rotor. The carb will need a rebuild too. I'm wondering if this could be the vacuum advance not functioning properly? The distributor is out of my old engine, and the old engine didn't have this problem. If you've had this happen to you or any ideas what it could be I'd love to hear from you. THANKS!