Holley 1904. Its a good solid carb, they made tons of these and go for cheap. Like $50 for a core on ebay. The kits are kinda pricey at about $50-$60. I like them. I got an auto choke one i want to use on a 3x1 setup but id part with it. Its all cleaned and all. Mine is a 1908 though, similar to the 1904 but meant for the 144 or 170