Carb for 273 commando

I can't find the cfm ratings of those two carbs. I looked in my 66 Dodge manual but no answer there. Your HyPo motor will run good with a 500 or 600 cfm carb.The 500 won't be too small and the 600 not too big. Unless the motor is built up with a big cam I wouldn't go further than a 600 myself. Mike