I don't think a 35' is a good fit for a 2366, its alot of weight for a machine of that size. As far a crop flow from a header that size, 30 bus wheat and 25 bushel beans the machine might take that type of yeild but whats the moisture of the crop at harvest and how fast do you expect to travel? Overall I personally think a 35 is just way too big for a 2366, I think a 30' might be too much as well because of the weight but it would handle the crop flow from a 30' better. I run a FD 30 on a 4WD 2377 and a FD35 on a 4WD 7010 and they seem to be good matches. Just my 2 cents......
We had 20ft auger header on our 2366 it was a load but our beans yield a lot more than those, I would say that 30ft would be maxing it out. But on the other hand We ran a 1083 corn head on ours some people said that was to much and it handled it great!
We had a 2366 that we ran a 25' 1020 & 1083 head on for four years. If beans were dry & stems were mature it would handle the 1020 with ease in 60 bpa beans but if they were green stemmed or tough there were many days I wish we only had a 20'. It would handle the 1083 in 200 bpa+ corn at 4-4.5mph.
When we wanted to increase soybean cutting capacity I wanted to go to a 30' draper head but dealer thought the head would be too heavy for it unless we added another cylinder & rear weights & suggested we trade for a 2388, which we did.