LarryWaldenIII

Hey guys, I have a 11 of 73 260z so it is a 74. When I got the car, it had hitachi flat tops on and after going through all the tests weather or not if I had spark, getting fuel to the carbs, etc... I have a really usefully manual that belongs to my dad, he was the one who got me into Z cars. Anyways, I got a pair of SU round tops of an 72 240z, my dad said that once I get them, and put them on the car should start right up. After putting them on and going through all the tests again, the right carb is getting fuel in the float, but the left carb is a total different story, I cleaned it out and put it back together, but no matter what I do it does not get gas. The only way I can start up the car is by spraying starter fluid and it will fire up, but it does not hold its idle. I am at a lose right now, can anyone give me some insight and advice?