[srode1]

As far as fitment the LT4 high pressure pump will mean you probably need to modify the firewall for clearance, for the pump and the electrical connections. That's the price of direct injection vs port injection. I'm sure you've read the other technical differences and that the LT4 has more torque earlier making for a flatter power curve too which is an advantage in any application IMHO. The wiring on the LT4 isn't really complicated, just plug stuff in and it works and it's gone in lots of cars so there's plenty of information on front runners.