Which 3.6L?
1) 964 3.6L
2) 993 NON Vram 3.6L
3) 993 Vram 3.6L
4) 996 3.6l (
)
All comes down to condition (mileage) and if stock or not.
The first 2 are likely $6-9k
A Vram a bit more
A stock 3.0L with CIS is maybe $4-5K
Clearly a newer (stock) motor will provide more power and torque, but will need a lot more "adaptor" bits to fit into an SC.
Steve Timmins (Not sure of his website -I think he lives in Delaware or South NJ) does 3.6l conversion for various cars and has a rough price list of the work and parts needed for such a conversion. Might be a helpful reference.