Check out your local scapyard. A carb from a similar displacement 4-cycle engine will do the job. Or a carb from a 2-cycle engine with about half the displacement of your 8hp (the briggs 8hp is 319cc IIRC). Check on snowmobiles, dirt bikes, four wheeler, etc. You will eventually find a nice carb at a very good price.
Good hunting :thumbsup: