Chainsaw Repair

New to the forum so be gentle

I have an older 359 Husqvarna that is giving me grief and I can't seem to figure it out.Two main issues first being that it will not start unless I pour fuel into the carb and then will only run long enough to burn through that small amount. I've pulled the carb (multiple times) cleaned it rebuilt it and still no start. I even bought an after market Chinese carb from ebay to try and still nothing. I had pull the cylinder off last winter to replace the intake manifold that had a service bulletin against it. Can't remember the reason but I think it was because of plastic/clamping issues letting air by but don't quote me on that. When I put it back together I threw new rings at the piston just cause. New gaskets all around. So the engine seems fine other that it will not pull fuel into the carb. I pulled the fuel line and cleaned the tank the filter looked good and seemed clear so I put it back in with the fuel line cut back a little to make sure I was not getting air along with fuel at the carb connection. STILL NO START!!! I'm out of ideas my first thought was the fuel pump bellows in the carb is compromised in some way but all looks fine. No impulse input on this carb either (I think that's the muscle to pump fuel if I understand it correctly)the intake has a hose coming off it and I pulled it and made sure it was clear still no joy.
Also the throttle trigger linkage seems to be busted, the lever that comes from the handle to the carb comes out of the handle when you pull the carb. Seems some internal plastic piece has broken inside the handle and it only goes back in and works if you hold your tongue just right but it doesn't springback on release on the trigger like it should but that's separate from the main issue obviously. I almost have given up so much so that I took it to a small engine repair shop thinking maybe I'm an idiot and an "expert" could find out what was wrong. That was a waste of time and money because as soon as he saw the throttle linkage issue he stopped work and called me and said that the handle is pressed together and you can not repair replace trigger assy pieces. He didn't even attempt to diagnose the starting issue. From my research it looks likely that you can replace the whole trigger spring lock assy and not have to throw the saw away. So I figure he didn't really want to work on it in the first place and this was a convenient excuse.
So question one what should I do to get it to start?
Can I replace trigger pieces without having to buy a whole new handle/fuel tank assy?
I'm a mechanic (airplanes/helicopters) so I'm losing my crap that this simple little machine is not cooperating with me.
Any help would be greatly appreciated.
Thanks

SO got the saw back still no start!! I'm being told that this may be an ignition issue and the CDI may be on its way out. I'm not sure if this is a possibility but its plausible. If the ignition is strong and then gives out once the saw gets a little warm that could be the issue. I'm skeptical but I'm open to the idea. Has anyone had CDI issues similar to this? Is there a good bench check I can carry out prior to throwing money at a CDI that might be fine?
Also I told that the crank seal may be bad and the extra air is leaning out the mixture to much for the saw to run. Is this a common problem to an older saw? I'm told the time and money in rebuilding it from the crank on up is not worth the trouble. Thoughts? I'm not afraid of the job but my time is more valuable than the cost associated with a rebuild. I rather like jobs that bring old stuff back to new condition. Not to mention the money saved and one less piece of garbage on the pile is always good. But I'm about ready to call it on the whole thing and get a few bucks for it in the condition its in now and get rid of the headache. Any one have an idea where to go from here?

Thanks