/6 Possibilities

Either go for power or go for gas milage.
You have to make that decision now and remember that it will still get good milage considering.

I had a 225 with lots done to it, lets just say, and still got 21mph @ 3800rpm going 80mph up the grapevine at a whole 175f engine temp.
Get full length header, mill .080, cam w/260-270ish duration, 350 holley 2 brl or 390cfm 4 barrel, 2200 rpm stall convertor and minimum 2.93 gear.

IMO