I never got to drive my basket case Mangusta. I'd say that Johnny Woods' method of eliminating rear bump-steer from suspension bind in the Mangusta is the best alteration one can make for that car. Once altered, the Goose rear suspension and handling is identical to a that of a GT-40. Most of my driving experience is 40 years in the Pantera and I approached its front brake locking problem from a different angle.
Instead of perfecting the non-adjustable prop-valve in the Pantera's front brake circuit, which reduces its stopping power, I put an adjustable valve in the rear brakes and rebalanced the whole system so the fronts were working more efficiently without a front prop valve. This was quite a bit more trouble -probably why Ford didn't do it- but it then allows phenomenal stopping power. Especially with big tires like the GR-4s used without a prop valve.