This model of carburetor has the square bore flange bolt pattern. If you have a spreadbore style intake manifold, you will need an adapter to install this carburetor. Similar to the Mr. Gasket #1932.
BR-67331 Brawler 4150 Race Carburetor
BR-67301 Brawler 4150 Race Carburetor
BR-67200 Brawler 4150 Race Carburetor
For Holley Quick Fuel Brawler 650 CFM Brawler 4150 Model BR-67255 Carburetor
BR-67211 Brawler 4150 Street Carburetor