Remapping a pin to SPI peripheral
The SCL pin is from the I2C module. Do you mean the SDO or SDI pins? 

In any case, if you have a look at the datasheet table 1-9, page 26 describes the SPI pinout and unfortunately, the SCK pin cannot be re-mapped but SCK2 is available on pin 14 for the 144 pin devices. As for the SDI and SDO pins, you also have to be careful as not all pins can be remapped to them however in table 12-2 we see that RPC1 can become the SDI pin for a few SPI modules and in table 12-3 we see that RPC1 could also become the SDO pin for a few SPI modules.