650 or 750 cfm. carb??

I have quite a stout 360 (~370HP) and have had 600, 670, 725 and 750 cfm carbs on. There is absolutely no difference in top end performance between the 670, 725 or 750 but the 600 and 670 have it all over the 725 and 750 in low/ mid range throttle response. I would recommend the 650 if the car is primarily a street car.

For a street car smaller is better when it comes to cams and carbs.