Well it wouldn't stay 1.8 for a start

,.. brakes are obviously going to be uprated as soon as any engine work is performed, and suspension would be replaced and tuned depending on power output and how the thing drives (I'm not looking forward to power steering),..
But, I'm just concerned about the front axle and standard gearbox being able to take more torque. I won't bother even looking at tuning the engine if it means a costly axle and gearbox replacement/rebuild.