Per Andy from Unity Motorsports. He is running 660's on this truck. Great tuning info on those carbs.
I ordered 4 primary blocks for a 1850 600vs Holley.. they work great but you must modify your baseplates to convert to have 4 corner idle mix screws.. if you don't want or need the 4 corner deal you can just bottom the mixture screws out and just use the Primary screws Hope this helps Andy
