as stated staying fuel injection will save money because the motor will already have intake,tb, and injectors. 5.3L make some good power, would be a nice daily driver. i bought a gen4 5.3L 60e complete for $1700. its a nice motor has an aluminum block, 799 heads, tbss intake,87mm tb, 30lb injectors. rated at 320 hp. its a nice driver. the swap can be done on your tight budget but not with a cam,stall verter, and headers