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The 996/997 GT3 crank has a 76.4mm stroke, and that is the part number you are referring to. The 80.4mm crank is for the GT3 4.0L, and is 3 times the price...
The 964 and 993 also uses 76.4mm cranks, but are different from the GT3 crank. The 964 and 993 cranks are also different.
As for your 3.0 or 3.2 case (they are different too), the 76.4mm crank would fit. Depending on if you are building a street or track engine, you could get a 993 crank (lighter than the 964 crank) or a GT3 crank. In any case I would go for a bigger (and definitely not a smaller as you suggest) oil pump from a 930 or a GT3. You may want the crank to be cross drilled for better cooling under high load/rpm.
The 3.0 and 3.2 main bearings should fit the 76.4mm crank, you will need new bearings in any new build...
Con rods from a 3.0L my be used (TBC), or GT3 Pankl Ti rods, or Carillo or Pauter steel rods.
What kind and size of cylinders and heads? And what fuel injection? And what cams? Everything has to match, and be built for the type of use you want or need. Is it a DD, a week end canyon carver, a DE/AX car, or a dedicated race car? They all will require different builds...
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1985 928 S3, 5-speed
1987 Carrera, current project
2012 Jaguar XF 5.0, Wife's d.d.
2009 Boxster,sold, 2000 Boxster, sold, 1995 993, sold, 2004 Maserati, sold, 2000 996, sold, 1971 914, my college car, 1966 911, sold way too cheep, Lots of VW's...
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