i have always used atf, never leaked past the seals like 10w does some times in hot weather.

you must have a14 or a15 for water jackets in head, dont need them any way.

theres info out there (im not the best to take it off as always have had running rich issues with them) but for the needles under neath, aparently you start by turning them all the way in then 1 full turn out from there.

the idle screws are pretty much a no brainer, adjust them to get a rough idle and fine tune from there. also dont forget a balancing tool to make sure are flowing similar ammounts, also check pistons drop at similar rates, one will always be slightly quicker than the other.

otherwise take it to an expert, i did and still gave me hassles, LPG will fix that