1986 la 360

Like others have said; You have got to get the timing sorted out first. You can throw a dozen carbs at it, but if the timing isnt at least close, they wont stick.
-If youre bringing the entire car to the mechanic and he hasnt put a light on it to prove the timing yet, I would be looking for a new man.
-If youre bringing him just the carb with instructions to rebuild, then its a little early to fault him.A stock rebuilt carb may work on a stock engine that is mechanically sound. Some deviations from OEM may require mods. Tired engines can be a challenge.
-Personally, I love TQs, but they cant always be made to work, because of the lack of tuning parts.Q-jets are well supported.Holleys can be made to work on almost anything, but they are not the best at low-speed applications,or economy.They are, however,an excellent track carb.
-Now that Eddy of yours seems well matched to your application, and is very well supported.I wouldnt be too quick to replace it. You just need to take the time to learn it or find someone who already knows it. There are several posters here who do know them well and are willing to help.It really is a great street carb.
-Sometimes you just have to plunk down the money and pay a TECHNICIAN that knows his stuff. An hour or two of his time will usually get it all sorted out,unless of course the engine package has issues; which shouldnt take him long to figure out.
-Cheers, AJ