With a mild cam and stock heads, IMO a used CH4B is your best bet if you're using a carb or throttle body injection. Now if you decide to do a big of a cam and a set of better flowing heads, consider an edelbrock victor efi intake and do a port efi system instead. Good, even flow to all cylinders and port efi, this is where you see the real gains over carb as you don't have the wet flow issues like with carb or throttle body efi on a cold start. Also you have minimal cylinder to cylinder a/f variations with a setup like that. Costs a little more, but if modern style turn key driveability and response is what you're after, IMO it's the best choice.