Help: Rich mixture TR3

["Andy" <amdixon@erols.com>]

Any thoughts on how to lean out the mixture on a 59 TR3 with the H6 SU's?
I've tried the LM needles and it didn't seem to make any difference.
They were rich so I rebuilt them (not the shafts - leakage there should lean 
them out?) to no avail.
Engine was rebuilt about 50 miles ago then sat for a couple of years - 
started occasionally. Engine fires right up. Why not? It runs like the choke's 
on. Runs strong.
Any hints on what to look for?
TIA
Andy D.