I've seen the carb your looking for on 55-73 chevrolets, they were the only two barrel used from 55-67 from what I understand, and found on smaller displacement v-8's till 73. I have three here but thay are in sad shape with frozen throttle blades etc. I have also been looking for some good cores, I have a 3X2 intake for a 4-71 blower that I'm piecing together for a future street rod project. I'm sure I'll stumble across some eventually but parts are definately getting harder to find these days. I did a 3X2 setup for my friends 32 Ford a few years back, kept the center carb stock, plugged the idle circuits on the front and rear carbs, and also plugged all the breather holes in the sides with small slugs of lead. The tripower works great and it's been 3 years now, no troubles.