On the question of anti-g suits: conventional g suits require support from the aeroplane that whilst not impossible, would be very hard to achieve in a piston engined aeroplane. I don't think it's been tried.
There is some newer technology being used, I believe, on the German Typhoon fleet, that if I understand it correctly, would adapt to an aeroplane like this quite readily, but I don't believe that it's been made available to the civil world as yet.
G