I will second the 2100 opinion. So far the thing has run flawless for me on my Scout II 304. I have not even tuned mine and with no choke it runs fine at any temp. I picked up a remanufactured one off of Ebay for $90.
My 2150 took a crap on me and I bolted up an old 2100 I had laying around. Without a rebuild the thing runs awsome. It's a little sensitive to altitude changes but a couple minutes of adjustment works it out great.