Use either engine it makes no difference really. Just need to source a few extra parts like fuel rail etc. Im sure Absys thread lists it all. Hardest bit will be getting the loom made up. I know United Motorsports can do it. Standalone just gives you a lot more scope for tuning things. But to me it sounds like you just want the standard engine plonking in, but even if you want cams, chargers, turbos etc the standard ECU will do the job for ya and keep it more OEM