Gizze wrote:So if I was to change to these would the engine run leaner (numbers generally increase but I'm not familiar with the nomenclature)?
as mentionned in posts above, there is usually more to it than just matching jet numbers (that may be the beauty and evil of the thing), and your degree of satisfaction (tuning figure of merit) has a role to play in the entire process... not yet specified.
to answer your question more precisely (yet in a general manner, as different jets get in action at different revs) :
fuel jets, the larger the richer
air jet (corrector) the larger the leaner
NB: the diffuser (part holding the main jet and the air corrector) has a major role to play in the mix
I would not worry too much about acceleration pump jets at this point (esp. not getting them larger), this is for smoothing the richness regime change when there is a sudden acceleration, fine tuning
also fuel level in the carbs (best measured from the jets brass opening) has a direct role to play in richness : this is important
last I'm a bit wondering about the 30mm chokes - though that should not prevent from getting a car in a decent state of tune (would only limit the WOT performance then)
I'm assuming all the rest is well (spark plugs of proper heat index, ignition set adequately etc), and in particular that idle settings have been carefully tuned (it can be surprising how far in the revs a LTC runs on the idle circuit, which fuels the idle via the springs screws but also the transition regime via the transition holes, up to 3500 rpm give or take 500)
if you are undertaking the tuning yourself and expect best help from the forum maybe you should provide more informations (esp. describe "too rich", including in relation with the rpm)