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The biggest cylinder bore you can have on a 3.2L block is 102mm, as opposed to the 964/993 block that you can have 105mm. The bolt spacing for the cylinders are different than the 964/993 engines. So the biggest displacement you can have with a 76.4mm crank is 3,746cc, or close to 3.8L. However, if you stroke the crank or get a GT3 4.0L 80,4mm crank, you can build a motor close to 4 liters.
As for the oil pump, you should NOT machine the pump itself, but you would need to do some machining of the case/block.
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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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