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1989 911 Carrera engine rebuild questions

Engine

Vehicle Information: Model: 911; Year: 1989; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 70,000;

I am in the process of gathering information for the rebuilding of my 3.2 liter engine. I've had high oil consumption for the past few years but recently had a total clutch failure, so I'll be dropping the engine. My car is a primary track car that has been upgraded over the past 4 years, (Turbo brakes, track tires, SSI exhuast,roll bar, suspension redone, etc.) The engine has never been out of the car, nor altered. What I am planning is 3.4 pistons/cylinders, 964 cam, extrudehoned intake to go with already present MAF, and all other items to beef up the engine for track use. Items considered are twin plugging. Questions I have: Any reason to crack the bottom half? The car has 70k on it. Should I twin plug only if going to higher compression pistons? Is the motronic induction system going to limit the power this engine can make? Would just going with 3.2l high compression pistons be a better choice. Along with a new clutch, I will be putting in more "track friendly" gearing to complement the engine.

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