He might be referring to the GTV 2.0 116 chassis. He didn't say what year and where he was posting from. If it is the GTV 2.0 116 chassis, the motor mounts will fit fine. Just get a GTV6 hood and you are pretty much set.The engine mounts are completely different,
A basic turbo will win that comparison - even a simple system will put out 200+ hp and be reasonable to drive. Probably not legal most places though.I would make a price chart detailing the work and expense to swap engines. Then make another one comparing it to the time an expense of turbo charging or supercharging the 4. Also compare the horsepower for money spent, or how much horsepower you can get either way given a specific budget.