Pretty hard to beat the old Holley 660 Center Squirters. List # 4224. A lot of them still being used by racers. I think they are still available new or check local Craigslist, swap meets etc. I believe Jay found they worked so well he used them for most of his testing of the factory 2-4v manifolds in his book, he can maybe comment on his observations. I don't have any info on the newer Quick Fuels, etc. I think Barry, Brent, Blair all have carbs available.