The P30 was originally intended to run the B16A motor. So, you *might* have a B16A instead of a B18C. You can check the block code to see what motor it is, it's kind of down and to the left as you're facing it, near where it bolts to the bellhousing of the transmission.

As long as you still have a B18C1 then it's really not a big deal, the P30 can run the B18C1 just fine.