Rod, I'm just going on how my tractor handles my 72" bucket. Your tractor has over 12 less hp and considerably less weight. Frankly, I think your dealer is trying to unload a left-over bucket on that left-over TC33D. If you find that bucket width works for you, I'd surely say, "Go for it!"
Perhaps others will chime in and give you their thoughts. There are a lot of Class II Boomer owners on this board with 7308 loaders. Their experienc and advice would be a great value if they can comment. Maybe you could start a new post titled "Can the 7308 handle a 68" bucket?" so they will get a little better feel for what you need to know.
I could sure be wrong about this, Rod. I do have misgivings, and I'd hate to see you get stuck with something when you could have a better tool at the same or lower price. I just want you to get the most work and enjoyment out of that great new tractor. /forums/images/graemlins/cool.gif