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Hiya,
Before messing with the internals of the carbs I would make sure there are no other air leaks. My brake booster leaks so it is permanently disconnected - you can check yours by disconnecting and plugging it off too (you also do not 'need' power brakes; I can lock up all 4 tires without the booster and the boots are a lot wider than stock). As Rhys has mentioned you will want to check your intake manifold over very well to make sure you do not have leaks at the manifold to head or manifold to carbs. What manifold do you have? If you have the same as me (at least the one on the car right now) there are secondary butterflies in the middle of the cast iron intake. If you have these, they are likely leaking - mine were. Remove. tap and plug with 1/8 pipe plug (the inside of the throttle shaft already has a plug).
Last but not least, we are at the carbs. Long before I would discuss needles, I would disconnect the throttle springs and wiggle the throttle shafts. Some people swear by using propane, butane, WD40, etc. but I have found that spraying extra fuel around is not always a good indicator of potential vacuum leaks. If the shaft has very much wiggle at all it is likely too much and you are getting 'spare' air around the throttle shafts; they are 41 year old carburetors after all. If this is the case you will need a throttle shaft rebuild - I recommend Rhys.
This does not rule out spare air from the brake booster an/or PCV system. In all likelihood you have multiple sources of spare air. Such is often the case when you are the umpteenth owner of a 40+ year old car. So, in summary, plug off all possible sources of spare air like the PCV, brake booster, and manifold butterflies (if you have them), check throttle shaft play in carbs (WITHOUT throttle shaft spring preload) and only then will it be pretty likely that the problem is not extra air leaning the mixture.
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