The 3.2 rod bolts are smaller in diameter and combined with the longer stroke crankshaft, that leads to more stress and less structural integrity at higher rpms.
You will need stronger valve springs, maybe Titanium retainers. Titanium valves or Stainless Steel would help reduce valvetrain inertia and let it rev. The rod bolts will need to be in tip-top shape for the track.
JMHO. 
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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