IMO you want to keep the weight centered and low as others have said, but you want to bias the distribution to the rear. I am not sold on 50/50 but my C6 Grand Sport Vette handled really well. Most of the high end cars are 45/55 up to what many consider the optimal #s of 42/58 (Ferrari 458/Veyron/Gumpert). Only the "911" gets over 60% rear that I am aware of and that car is a whole 'nuther discussion in itself.
My mid engine car is frankly pretty darn fast on the track these days and I am at 43/57 weight right now like an Aventador. The bulk of the transaxle is behind the rear wheels (trans behind the diff, Corvette is trans in front of diff), and the radiator is in front of the front wheels, otherwise all other weight I did my best to place between the wheels.
Key to a bit extra rear weight is that it is easier to put wider tires back there (since they don't have to turn) for more lateral grip to carry the weight through the turns, and a road race car typically doesn't transfer weight like a drag car does (else when you hit the brakes going into a turn all hell would break loose) so having the weight statically biased there helps plant the aforementioned wider tires for traction out of the corner.
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