You can definately build a K for under 7 now . Pick up a K24 shortblock buy pistons A2 oil pump and a stock A2/Z1/Z3 Head with an RBC and a EBay header you can make 250+
Most money you'll spend is on K-Pro and Your Header and mounts . All of the K stuff is getting cheaper ...
turbo D's are almost at the 500whp mark . sounds capable enough for me . still for less .