Test N Tune, what will it run

Going to take the wifes Duster to test n tune tomorrow and curious what you thought it would run. Stock bodied 73 Duster with air and power steering, no other power options. 340 is stock 69 340 with headers and flowmasters and edelbrock 600 carb. stock 727 with 8 1/4 open 3.21 gears, what do ya think?