I built my own 2 circuit 1250 and love it. Start by taking the intermediate bleeds out, put in .025 HSAB's, and jet up to 98 for starters. As long as you don't get an uncurable lean condition at WOT, you can probably plug the intermediate jets as well, it depends on what you have for metering blocks and what mods were made if any. This is a very common issue with a 3 circuit carb. After plugging the 3rd circuit you can't get WOT rich enough I'll get you more info.