318 rebuild or 360 swap

[RAM318]

I NEED SOME ADVICE. IVE GOT A D150 RAM W/318 PERFORMER INTAKE AND CARB. CHRYSLER PERF. DISTRIBUTOR AND ORANGE ECU. DUALS W/TURBOS AND A 727 TRANS. ITS A DAILY DRIVER SO MPG IS IMPORTANT BUT SO IS HP AND TORQUE. I DONT KNOW IF I SHOULD SWAP OUT THE HEADS , UP THE COMPRESSION AND ADD A CAM OR GO WITH A PERF.360 SHORT BLOCK FROM MOPAR AND PUT THE NEW HEADS ON IT. IM LOOKING FOR GOOD POWER UP TO 5000 RPMS .THE MOTORS TURNING 2900 RPM AT 79 MPH NOW. IF I GO WITH THE 360 SHORT BLOCK I WOULD PROBABLY CHANGE YHE CAM TO SOMETHING MILDER. THE TRUCK HAS AIR ,PS AND PB. IM NEW TO MOPARS AND AM IN THE DARK HERE. HELPPPPPPP!!!!!