Was just wondering what would be the best power package for a track car
Assuming you already possess Lewis Hamilton style driving ability, i would attack your car in the following manner.
Brakes - more stopping power = more confidence = later braking = quicker round a track
Suspension - a fully adjustable setup will allow you to hone the character of the car to your liking, we are all different, some like a twitchy rear, others prefer a more stable rear & greater understeer on the limit, etc etc. Other peoples opinions aren't necessarily that important here - its YOU that drives the car.
Stripping - lighter weight = instant bhp per ton (for free)
Engine - once the above is done, then play with the engine imho.
Remember on a clio, big bhp = big money