its not SSIC...its SSAC..totally different intercooler.
Ones liquid---liquid
The other is liquid-air.

I wouldnt get just a stock transmission. If you're planning on putting down 300hp, your gonna start tearing up stock trannies.
See about a TEP tranny, or similar trannies.

I'd say if the bottom end is good, just rebuild the top, with go fast stuff, and be happy.