'70 MGB running rough above 3300rpm

[Lane Rollins <laner@teleport.com>]

Above about 3300rpm the B starts missing, if you pull out the choke it
seems to run better. I'm assuming one of the jets is 'clogged' and that
pulling the choke out causes the other carb to compensate for the one
having the problem. Is this reasonable guess? Is there a way to tell wich
is the problem child? Or don't be so cheap and replace both jets?

TIA, Lane