I have not used the 123 ignition so cannot comment. I know Voldat has used them, try
@Ghettobird for advice.
I had the lynx and a 40 DCOE on a 140 recently and it was great. It had short flutes (from Weber Performance) and a K&N filter. The filter mount needed to be machined out a little to fit the flutes, though it was pretty solid once done. I think the filter needed to be moved up a few mm to clear the steering column, cannot remember.
Regarding chokes, aux chokes, and jets call Daniel from Weber Performance, he will sort you out. He is expensive, though very good.
Black mats and a biege carpet, we should talk...