273 help!

have a 67 dart 270. the numbers motor is a 273 and would like to know if this motor can make some power or should i put it under the bench and build a 340 for it? 727 tranny 8 3/4 sure track rear. the car runs great but i would like some more jam. any help. also, will the 340 bolt up to the 273 727 tranny?