Base model K20A3 comes with 160 hp.
That's 20 less than JDM B18C.
So you can look at it 2 ways...You can sell the K for possibly even $2k, but then you're $500-$800 short of buying the B18C. And if it's going into a sol than the linkage and cv axles should fit in the sol, on the other hand, with the K, you would have to get custom ones to fit. B would definatly be your better choice, but if you're on a budget, stick with what you already have.