I've never put one on myself, but I transplanted an engine which had one on it and had to do throttle cable stuff! You'll have to
make a custom throttle cable linkage as the regular cable doesn't "bolt up" with the weber one. I'm not sure if you need to on
others, but I had to put a custom (secondary) throttle return spring on as the throttle would not return properly with the single
spring.. What my dad did for me was use the old throttle linkage off the aisin carby (if you have an old, broken one lying around
try use that as you may want to put the old aisin back on one day. Or get one from wrecker), then welded it to the weber linkage.
My dad also made an adjustable cable mount on the rocker cover. Mine are a little dodgy, but I was in a hurry :) PICS! Sorry about
quality. The lens on my camera phone is dirty.
The spring is my throttle return spring, not an ideal way to do it, but it worked for me. Get a long, tightly coiled spring and attach it
the filter or something suitable. HERE is the recommended type/method. :P