go for it. if you want over 350whp i would say go built b18c1 or built lsvtec...you'll have more room to grow. if you want 250-350whp then building a d-series isn't bad. you can get more on a d-series, but by the time you spend on head work, cam, etc. you couldv'e built a mild b-series and reached that and have a lot more room to go.