Usable power for the street?

My guess is 3.23 or 3.55 gears but if you got 67 "S" you may have 3.91 SG gears

Just read your post. 2.76 or 2.93...terrible 273 gears! Get some 3.55's and then make your motor decision. 273/4 is a beloved motor, they like to rev but are soft down low but a 4sp will make up for that.