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55/45 f/r weight distribution is not so great to begin with for putting down decent power in a rear-drive car, even with a very short flat-4 engine. With a big long cast-iron turbo inline 6 mounted up front, it's surely worse, 57/43ish I'd guess? Not good... A 50/50 car would have 16% more static load on the rear wheels, and could load them up more under acceleration.
A big rear wing would help at speed, but in the lower gears you're not going to be putting much power down without adding mass to the rear of the car.
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