hi mate welcome to the club car looks great B) engine wise - what power do you want? the gearbox will be the weak point point, the hawk has the strongest 5 speed, usually rated up to 380bhp, but some are still running fine with 400-420bhp. it depends how sympathetic you are and if you ever launch it. I would keep with the std 2.5 size and aim for 360-380 bhp and over 400lb torque, that will make a fast road car (smaller, punchy turbo) you should still get ok fuel economy too with 550 injectors (they are big enough for 420bhp+)
@3.5 BAR