Tires / diff ratio advise

A Body 440 WHY NOT said
the cam builds at roughly 3000 to 6000 rpms.

should I go 355 ratio and 15" tires ( taller 27/28" dia ) , or 323 ratio and 14" tires ( not as tall. 25" dia).

Did you dyno the engine? How do you know where it builds power? If it's based off the powerband on the cam card you might as well throw it in the garbage, most often TOTALLY inaccurate.

3.55 and 15" wheels with 27 - 28" tires is a no brainer.