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Modern turbos spool so fast that I'd lean towards a T4 flange. Later on, if you decide to turn it into a beast of a turbo engine, you won't be choked.
I don't think you have to worry about over powering the engine, they are quite robust from my understanding. I know the 3.2's in stock form can take just about anything you throw at them.
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel
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