With an engine that has broken in, you can close the idle trim port fully, with Clockwise turns of the screw.
As far as where to start with the needle, remember that you only have 3 threads on the adjuster. So from fully Clockwise (rich) to max lean that's all you have to work with . More than 3 CCW and the needle carrier will loose contact with the adjuster and although the adjuster will continue to turn, the needle will not change altitude.
I start 1 1/2 CCW turns from full CW.
Do you have a Throttle Bypass Valve on those carbs ? If you do and they are functional and the diaphram around the brass valve is still flexible, then a good starting point is 8 CCW from fully CW.
Unlike the SU carbs you won't find a wide selection of metering needles, only 2 and I think they have pretty much the same dimensions. Regardless, I don't think removing the emission stuff has an effect on the fuel mixture requirements, at least not enough that it can't be adjusted with the B1AF needles.