I just bought an early 74 260z, and it had the nasty flat top carbs on it. The car did come with an early set of SU carbs(4 screw). I've got them all bolted and hooked up, except for the linkage which is too short. I've adjusted the thumb screw at the bottom starting at the top, 2.5 rev's down on each one. I choked them up but I can't get it to start! Its getting fuel. The old flat top carbs ran, so its no other problems. Any other suggestions? Do I really need the linkage to make it start up. I opened the butter fly's about 10% trying to get it to start up. Help!
Phyte