Thanks for all the advice. Timing was actually the issue. It had moved since I had set it because I didn't tighten it down enough. Eventually fired up. Had to baby it for a second and then got it idling well. Set timing to 9˚BTDC and drove it around. Flat spot off idle then surges at 1/3 throttle. Dead when the secondaries open. Time to mess with the four trillion doohickies on that carb.