Came across most of what you were asking.
http://www.clarks-garage.com/shop-manual/951_eng_perfmod.htm
I think using a 3.0 block and then over bore, sleeve and using the 944 Turbo head/modified is easiest.
These guys can do it but it cost bank.
http://www.powerhaus.com/944t.htm
I have No first hand experience to share.
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1987 924S with 968 Drive front to back, Bilstein Insert on mod/stock Struts, 450# Hypercoils, 28mm Torsion Bars, Weltmeister Adjustable Sway Bars, Lindsey 968 Light flywheel, Spec Stage II Clutch, ToYO RA1's, Auto Power Cage & 6 pt Harness, KLA Strut Brace, Greasy hands, heavy foot, and lots of smiles
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